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Best Household Sensors & Alarms

Nest Protect Smoke and Carbon Monoxide Alarm, Protect Your Home From Fire and Gas Leaks, Even When You're Away, Battery Powered (Second Generation)
It has a Split-Spectrum Sensor, tests itself automatically and lasts up to a decade. The Nest Protect can alert the Nest Thermostat when it detects carbon monoxide and the Thermostat can turn off the furnace to try and reduce the leak while you get to safety. You no longer have to spend time worrying about whether or not your smoke detector is still working, or what the blinking lights mean; Nest Protect can tell you everything you need to know! With automatic battery self-check, the Nest Protect helps take the hassle out of dealing with smoke alarms. Whether it's burnt toast in the kitchen or carbon monoxide in the living room, the Nest Protect uses clear spoken messages to alert you to the danger. The Nest Protect also works with most cellular devices, allowing you to receive notifications on your phone whenever something happens. Long before it has to chirp, Nest Protect tells you its batteries are running low with a message on your phone. With routine self-checks as well as being able to remotely test all the devices in your home; Nest Protect takes the hassle out of dealing with your smoke alarms, and helps to put your mind at ease. Connect Nest Protect to Wi-Fi and it will send an alert to your phone if the alarm goes off or the batteries run low.
Reviews
"Random low-battery chirping, ear piercing function test... getting up on a ladder at least twice a year to change batteries wether they need it or not... you get the idea. After seeing some of the negative reviews around random alarm problems I intentionally delayed purchase until a 2nd generation product was available. With the new Protect 2 out and getting almost universally positive reviews, I went ahead and took the plunge following a 4 year old First Alert CO combination unit dying with 3 chirps every minute at 3:00AM. I'm also cautiously optimistic more features could be added later to the existing hardware... as Nest already has a track record of doing this with other products (Nest Thermostat added air wave which is a fantastic feature). There is also a nice very solid mounting plate with mounting holes for probably every international junction box imaginable as well as some sheetrock screws if you are installing it in bare sheetrock and a few extra wire-nuts if you need those. Do NOT remove the battery activation tab until you are ready to program the Nest Protects! Here's how I installed my 8 units in a relatively short amount of time (90 minutes total) with some tips that might help you out. Your not-yet-programmed Protects are on your left, your workspace and mobile device is in the middle and your already programmed protects are on your right... make sure you know your wifi network name & password as well as your mobile having a good solid charge (you're going to be at this for a while). This all takes at least a couple of minutes, if it sits there for 90 seconds don't give up, it's still working and everything should be fine. Don't pull the tab to turn on the 2nd protect until the app is connected or connecting to the 1st device... you can cheat a bit and pull the tab and choose English language about 30 seconds before the app says to do this and install will go fine... if doing many Protects this saves a bit of time. Once done with all programming move on to physical activation by choosing not to add any more Protects from the app. Turn off AC breaker to your wired detectors (if your house is newer they are probably all on a single circuit breaker)... remove the old protector and mounting plate and disconnect its wiring harness. Tap the button one time to verify that the detector you are installing is the correct one for that location (you labeled your boxes right?). Line up the plastic ring on the mounting plate with the round detent on the Protect. If it seems too hard (it's not, assuming you can turn a screwdriver, stand on a ladder and understand electrical basics) you can hire a pro... Nest provides info on how to get in touch with one on a flyer in the box. There are other minor things I think could be improved.... the square design is a pain in the neck to get aligned properly so that it doesn't look crooked on a ceiling... while this won't bother everyone it will annoy enough of us that we will keep mentioning it. Currently Nest does not offer the ability to customize the Protect settings on individual devices. Nest should step up here as they surely know that many homes are going to need a pile of these things and they aren't exactly cheap. While I was confident enough in the design of the Protect 2 to spend a whopping $794 on eight of them Nest has left a bad taste in many peoples mouths by not addressing 1st gen problems. If similar problems were to occur several years down the road with the Protect 2 I similarly don't expect much from Nest in the way of a real resolution... even though Nest has been acquired by Google they are the new kid on the block.... they should be really stepping up for their customers instead of responding to negative comments about Protect 1 with "contact customer support"."
"I live in a smaller apartment and sometimes when I cook, my old alarm would go off (I dunno why, I cook all the time, in fact I've got something cooking while I type this review). Note: This is still an early review and I can't really judge it until I've used it. At first I didn't think the night light would work very well but in the dark it provides just the perfect amount of light. Also the wired version still comes with batteries so the testing can be done when you have it unplugged and it will still work if the electricity goes out. Update 8/4: Last night I was cooking up a delicious meal and I had enough smoke to trigger the alarm. When it first noticed the smoke it gave a verbal warning that it detected smoke and would sound the alarm soon. Just last night the power went out and it told me "Heads up, the power is out.""
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Nest Protect Smoke and Carbon Monoxide Alarm, Protect Your Home From Fire and Gas Leaks, Even When You're Away, Wired (Second Generation)
It has a Split-Spectrum Sensor, tests itself automatically and lasts up to a decade. The Nest Protect can alert the Nest Thermostat when it detects carbon monoxide and the Thermostat can turn off the furnace to try and reduce the leak while you get to safety. Enter your model number to make sure this fits. With four beautiful colors to choose from and an easy to read display, this thermostat will help make your home not only smart but energy efficient. You can even choose a digital or analog clock face. Farsight is big and bright on the beautiful display – you can see it from across the room. That’s how we’re creating the thoughtful home: A home that takes care of the people inside it and the world around it. Wireless:Working Wi-Fi connection: 802.11b/g/n @ 2.4GHz Wireless erconnect: 802.15.4 @ 2.4GHzWireless: Working Wi-Fi connection: 802.11b/g/n @ 2.4GHz Wireless Interconnect: 802.15.4 @ 2.4GHz Bluetooth Low Energy (BLE).Tells you what and where: It speaks up to tell you if there’s smoke or CO and where the problem is, so you know what to do.
Reviews
"Random low-battery chirping, ear piercing function test... getting up on a ladder at least twice a year to change batteries wether they need it or not... you get the idea. After seeing some of the negative reviews around random alarm problems I intentionally delayed purchase until a 2nd generation product was available. With the new Protect 2 out and getting almost universally positive reviews, I went ahead and took the plunge following a 4 year old First Alert CO combination unit dying with 3 chirps every minute at 3:00AM. I'm also cautiously optimistic more features could be added later to the existing hardware... as Nest already has a track record of doing this with other products (Nest Thermostat added air wave which is a fantastic feature). There is also a nice very solid mounting plate with mounting holes for probably every international junction box imaginable as well as some sheetrock screws if you are installing it in bare sheetrock and a few extra wire-nuts if you need those. Do NOT remove the battery activation tab until you are ready to program the Nest Protects! Here's how I installed my 8 units in a relatively short amount of time (90 minutes total) with some tips that might help you out. Your not-yet-programmed Protects are on your left, your workspace and mobile device is in the middle and your already programmed protects are on your right... make sure you know your wifi network name & password as well as your mobile having a good solid charge (you're going to be at this for a while). This all takes at least a couple of minutes, if it sits there for 90 seconds don't give up, it's still working and everything should be fine. Don't pull the tab to turn on the 2nd protect until the app is connected or connecting to the 1st device... you can cheat a bit and pull the tab and choose English language about 30 seconds before the app says to do this and install will go fine... if doing many Protects this saves a bit of time. Once done with all programming move on to physical activation by choosing not to add any more Protects from the app. Turn off AC breaker to your wired detectors (if your house is newer they are probably all on a single circuit breaker)... remove the old protector and mounting plate and disconnect its wiring harness. Tap the button one time to verify that the detector you are installing is the correct one for that location (you labeled your boxes right?). Line up the plastic ring on the mounting plate with the round detent on the Protect. If it seems too hard (it's not, assuming you can turn a screwdriver, stand on a ladder and understand electrical basics) you can hire a pro... Nest provides info on how to get in touch with one on a flyer in the box. There are other minor things I think could be improved.... the square design is a pain in the neck to get aligned properly so that it doesn't look crooked on a ceiling... while this won't bother everyone it will annoy enough of us that we will keep mentioning it. Currently Nest does not offer the ability to customize the Protect settings on individual devices. Nest should step up here as they surely know that many homes are going to need a pile of these things and they aren't exactly cheap. While I was confident enough in the design of the Protect 2 to spend a whopping $794 on eight of them Nest has left a bad taste in many peoples mouths by not addressing 1st gen problems. If similar problems were to occur several years down the road with the Protect 2 I similarly don't expect much from Nest in the way of a real resolution... even though Nest has been acquired by Google they are the new kid on the block.... they should be really stepping up for their customers instead of responding to negative comments about Protect 1 with "contact customer support"."
"I live in a smaller apartment and sometimes when I cook, my old alarm would go off (I dunno why, I cook all the time, in fact I've got something cooking while I type this review). Note: This is still an early review and I can't really judge it until I've used it. At first I didn't think the night light would work very well but in the dark it provides just the perfect amount of light. Also the wired version still comes with batteries so the testing can be done when you have it unplugged and it will still work if the electricity goes out. Update 8/4: Last night I was cooking up a delicious meal and I had enough smoke to trigger the alarm. When it first noticed the smoke it gave a verbal warning that it detected smoke and would sound the alarm soon. Just last night the power went out and it told me "Heads up, the power is out.""
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Kidde KN-COPP-3 Nighthawk Plug-In Carbon Monoxide Alarm with Battery Backup
Protect your family from the dangers of carbon monoxide (CO) exposure with the Kidde KN-COPP-3 Nighthawk Plug-In Carbon Monoxide Alarm with Battery Backup and Digital Display. Plug-in unit with battery backup and digital display that shows CO level Level button displays the peak CO level recorded by the alarm since it was last reset Loud alarm pattern sounds when unit detects elevated CO levels Direct-plug, 6-foot power cord, and table top mounting options. The easy-read digital display updates every 15 seconds to indicate any abrupt changes or alarming trends in CO levels. Audible Alarm Pattern Alerts you to Elevated CO Levels When placed on every level of your home, alarms like the KN-COPP-3 Nighthawk can help protect everyone in the house from CO exposure by giving you an unmistakable signal when levels have reached an unhealthy point. If unhealthy levels are detected, the alarm will emit four quick audible beats every five seconds until either levels decrease or the reset button is pressed. Easy-to-Read Digital Display Shows CO Levels The KN-COPP-3 Nighthawk is unique among traditional CO alarms because of its digital display. This display clearly shows levels of CO that the unit has detected and stored-- from 30 to 999 ppm--and it updates every 15 seconds to indicate any abrupt changes or alarming trends. Peak Level Button -Displays the peak CO level recorded by the alarm since it was last reset or unplugged.
Reviews
"Make sure you check that when you get yours but it looks like Amazon has fixed the issue of sending out old items. It breaks it down into different groups in how fast it will alarm based on how much of a reading it will get. This prevents a small reading from something like a cigarette or from the oven door opening shortly from setting off the alarm and being an annoyance. I'm using the wall plug but people have complained about it draining battery still then."
"(just don't have it too far away or it may not be as effective in the case of a CO leak). We were just measuring the fumes from an engine that was switched off, just as if you came home, parked and turned off your car, got out and shut the garage door. We are very happy with how the Kiddie Nighthawk CO detector works and are very glad to have it in our home - great peace of mind from a great product that we wouldn't hesitate to recommend to others."
"The unit has a 5 year warranty and 5 year expected use life, so I called Kidde customer support. She also commented they have had problems with Amazon shipping such items that were already past their 5 year service life when they were sold. If you buy one of these units from Amazon (or elsewhere) my advice would be the check the sticker on the back of the unit as soon as you receive it, and verify that the manufacture date is reasonably current."
"The unit had been plugged in for a number of years before it failed."
"Just failed, error code says something like its at the end of its life."
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Best Gas Detectors & Alarms

SGILE Combustible Natural Gas Detector Propane Sensor Portable Gas Leak Detector with Sound Light Alarm Gas Sniffer
SGILE combustible gas detector is a highly sensitive, wide-Srange gas detector, which detects methane, natural gas, coal gas and other flammable gases in various situations and locations. 🎄Detects combustible gas leak - Methane, natural gas, coal gas, gasoline, alcohol, ketone and other flammable gases.
Reviews
"We have found 2 gas leaks in our recently purchased home."
"Works great."
"The SGILE Combustible Natural Gas Detector works just as I hoped it would."
"Works great."
"This thing works!"
"Did what it was made to do."
"Easy to use and well made."
"Awesome worked like it said."
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Best Water Detectors & Alarms

Zircon 68882 Leak Alert WiFi - Smart Electronic Water Detector Alarm with Email, Audio and Visual Alerts - Battery Included
Name each wifi water sensor with its location during set up and email alerts will direct you immediately to the source of the alarm!
Reviews
":) Unlike a fire alarm, if this thing goes off you can run and shut off the water and mop the mess up before any real super damage is done. You should just put them around every water appliance you have…. Although a water leak won’t kill you, every home should have a bunch of these just like fire alarms!"
"When the slightest moisture makes contact with the sensing probes it alarms with piercing noise, which is helpful if someone is within ear shot."
"Just the other day one started beeping behind the toilet in the hall bathroom and when I went in I found someone had used the plunger and some water had leaked out from the holder."
"And like a number of smarthome things which work with a smartphone and send you alerts etc., this one is basic."
"However, I think they could have placed the sensor in the bottom corner, allowing them to be located either horizontally or vertically, and then weight them so that if the water rises high enough when they are standing in the vertical position, they would fall over onto their back and float."
"I had a problem in the basement (water leaked from boiler) and this sensor was the one to alarm the issue."
"Plenty loud to here it when on different levels of the home, but not so obnoxiously loud that you don't want to enter a room when it is going off."
"We turn the water off when we're gone, but not at night so this was a good safety precaution."
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Best Smoke Detectors & Fire Alarms

First Alert BRK 9120BFF Hardwired Smoke Alarm with Battery Backup, Single
A loose neutral (white wire) connection within the home junction box could prompt a device malfunction. This 120-volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast-flaming fires and alerts you with a loud 85-decibel alarm. Designed to be wired directly into your home's electrical system, this hardwired smoke detector features a backup battery that helps keep the alarm functioning even in the event of a power outage. This smoke alarm can integrate with up to 12 other First Alert or BRK hardwired alarms and features a latching indicator that identifies which unit triggered the alarm. The 9120B AC-powered smoke alarm with battery backup includes these features: Perfect mount system including a gasketless base for easy installation and new mounting bracket that keeps the alarm secure over a wide rotation range to allow for perfect alignment. Open mounting design for easy installation with side load battery compartment for quick replacement and interconnectable up to 18 units (12 smoke, 6 CO/heat/relay).
Reviews
"Replace an entire house that had previous BRK 4120B's that were outside of the supported working status and were randomly going off or failing."
"After looking at the 3 units, I noticed corrosion on the 110 volt pins and across the circuit board itself, which may be the failure reason."
"His older AC powered smoke alarm had failed, (different manufacturer). • A wiring harness with a plug in connector. • An instruction manual. • A dust cover to use if the home is under construction so the smoke alarm is not exposed to dust and dirt. The orange wire is not stripped, to remove the insulation and expose the conducting wire, and the tip has been dipped into a plastic sealant to avoid any shorting issues. It is located on the side of the alarm module and it swings out to allow you to change the battery and it latches closed."
"When we had the house built it had all Kidde alarms but it was easy to put these in instead as they came with all mounting hardware needed. These came with 9V backup batteries pre-installed, I just had to remove the plastic tab to activate them."
"one of them is at the top of a high wall making it hard to reach without a long ladder so it is hardwired, the others are all run by battery."
"Being a fire protection specialist for over 35 years, I chose these because they have all the features I need, plus the price was great."
"You either have to remove the original mounting bracket and might have to deal with touch-up painting (or have to deal with the original bracket that was painted over)... ... or, install the new bracket on top of the existing bracket."
"Fits the standard smoke detector jack to replace your existing wired detector."
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Best Carbon Monoxide Detectors

Kidde KN-COPP-3 Nighthawk Plug-In Carbon Monoxide Alarm with Battery Backup
Protect your family from the dangers of carbon monoxide (CO) exposure with the Kidde KN-COPP-3 Nighthawk Plug-In Carbon Monoxide Alarm with Battery Backup and Digital Display. Plug-in unit with battery backup and digital display that shows CO level Level button displays the peak CO level recorded by the alarm since it was last reset Loud alarm pattern sounds when unit detects elevated CO levels Direct-plug, 6-foot power cord, and table top mounting options. The easy-read digital display updates every 15 seconds to indicate any abrupt changes or alarming trends in CO levels. Audible Alarm Pattern Alerts you to Elevated CO Levels When placed on every level of your home, alarms like the KN-COPP-3 Nighthawk can help protect everyone in the house from CO exposure by giving you an unmistakable signal when levels have reached an unhealthy point. If unhealthy levels are detected, the alarm will emit four quick audible beats every five seconds until either levels decrease or the reset button is pressed. Easy-to-Read Digital Display Shows CO Levels The KN-COPP-3 Nighthawk is unique among traditional CO alarms because of its digital display. This display clearly shows levels of CO that the unit has detected and stored-- from 30 to 999 ppm--and it updates every 15 seconds to indicate any abrupt changes or alarming trends. Peak Level Button -Displays the peak CO level recorded by the alarm since it was last reset or unplugged.
Reviews
"Make sure you check that when you get yours but it looks like Amazon has fixed the issue of sending out old items. It breaks it down into different groups in how fast it will alarm based on how much of a reading it will get. This prevents a small reading from something like a cigarette or from the oven door opening shortly from setting off the alarm and being an annoyance. I'm using the wall plug but people have complained about it draining battery still then."
"(just don't have it too far away or it may not be as effective in the case of a CO leak). We were just measuring the fumes from an engine that was switched off, just as if you came home, parked and turned off your car, got out and shut the garage door. We are very happy with how the Kiddie Nighthawk CO detector works and are very glad to have it in our home - great peace of mind from a great product that we wouldn't hesitate to recommend to others."
"The unit has a 5 year warranty and 5 year expected use life, so I called Kidde customer support. She also commented they have had problems with Amazon shipping such items that were already past their 5 year service life when they were sold. If you buy one of these units from Amazon (or elsewhere) my advice would be the check the sticker on the back of the unit as soon as you receive it, and verify that the manufacture date is reasonably current."
"The unit had been plugged in for a number of years before it failed."
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Best Combination Gas & Carbon Monoxide Detectors

Kidde KN-COEG-3 Nighthawk Plug-In Carbon Monoxide and Explosive Gas Alarm with Battery Backup
Carbon monoxide & explosive gas nighthawk alarm, protects from 2 deadly threats, detects carbon monoxide, natural gas methane & propane butane, AC plug with hide a way cord allows direct or remote plug in, battery backup, provides digital readout of carbon monoxide level, peak level memory, 85 decibel alarm, UL listed, clam shell. Protect your family from the dangers of carbon monoxide (CO), methane, and propane exposure with the Kidde KN-COEG-3 Nighthawk Plug-In Carbon Monoxide and Explosive Gas Alarm. KN-COEG-3 Nighthawk. Carbon Monoxide and Explosive Gas Alarm. At a Glance: Plug-in unit with battery backup and continuous digital display Level button displays the peak CO level recorded by the alarm since it was last reset Loud alarm pattern sounds when unit detects elevated levels of CO, methane, or propane gas Direct-plug, 6-foot power cord, and table top mounting options. Audible Alarm Pattern Alerts you to Elevated CO and Gas Levels When placed on every level of your home, alarms like the KN-COEG-3 Nighthawk can help protect everyone in the house by giving you an unmistakable signal when gas levels have reached an unhealthy point. If methane gas or propane gas is detected, the alarm will emit beeps every other second with "GAS" shown in the display. Easy-to-Read Digital Display Shows CO Levels The KN-COEG-3 Nighthawk is preferred among traditional CO and explosive gas alarms because of its digital display. What's in the Box Kidde KN-COEG-3 Nighthawk Carbon Monoxide and Explosive Gas Alarm, 9-volt battery, mounting hardware, and installation guide. Kidde’s carbon monoxide alarms meet the requirements of Underwriters Laboratories (UL), an independent facility that tests products for compliance with widely-accepted safety standards.
Reviews
"I've been using these Nighthawk CO & explosive gas alarms for well over a decade. I've never had one false alarm."
"We ahve used this one since 2012 when we converted to a gas furnace.It has never gone off thankfully but we trust this brand and unit.We got this one for our living room where we have a propane stove.Love the fact that these last 7 years and that they let you know when its time to replace."
"Was looking for a new carbon monoxide detector and saw that this kidde model detects both co2 and gas."
"A carbon monoxide detector was on their wish list and I chose it because of the good service I had with a different model."
"Really hope I never need to know how well this works, but glad I have it."
"CPS Tech stated that alarm was properly installed, but clearly was not operating correctly.. Needless to say, I will be returning item..."
"OK, sorry about that, I did the explosive gas test... I blasted it with my pipe soldering torch (no flame) plenty of "Propane" and over 10 minutes of testing I was shocked how bad it is."
"We were very excited when it arrived and have been looking forward to it, however, we had noticed the manufacturer date was 10/15 (4 of them) and 1 with 01/16, We were disappointed because this is the date Kidde uses for their 5-year warranty coverage, which means these devices were already one year old, and 10 months old, respectively."
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Best Garage Door Sensors

Chamberlain G801CB-P / LiftMaster / Craftsman Garage Door Opener Replacement Safety Sensors, Includes 2 Sensors, Mounting Brackets and Hardware
The Chamberlain Garage Door Opener Replacement Safety Sensors (2-Pack) help make sure your garage remains safe. Detects objects in the path of opening/closing garage door to help prevent accidents.
Reviews
"I have a Craftsman opener from the mid to late 80s where the motor was ok but the sensors were beaten to a point of questionable use."
"Works great on my 15 year old Sears 3/4 HP opener."
"I used them to replace some old ones that were malfunctioning and every time it was sunny my garage door wouldn't shut."
"If you do not get the wire end in completely it can slide off or not provide a complete connection."
"Very easy to install, two wires, uses the same brackets and light tells you if they are placed correctly."
"I replaced the sensors on my Liftmaster (made 2005) with these, works right out of the box and gets the job done."
"Solved the problem of my garage door not closing all the way."
"Garage door had stopped closing and would automatically go back up unless I held the wall button down until completely shut."
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Best Engine Exhaust Tools

GearWrench 2031DD Exhaust and Tailpipe Cutter
It has fifteen (15) blades that effectively cut pipe, so only a 1/4 inch rotation is needed for a complete cut. Use tool to cut pipes 3/4-Inch to 3-Inch in diameter.
Reviews
"I tried this on my 2" diameter muffler pipe, and found that it couldn't even "catch" on the closest cutting blade (i.e., ideally, you open the wrench, then close it on the closest cutting blade (i.e., each blade has a "pin" which "mounts" on the wrench)). Once the wrench clamps down on the pipe, it "bites" right into and through the stainless steel pipe like butter (even though it says it won't work on stainless steel!"
"I had to use a vice-grip and clamped it on the handle to get it to cut the pipe."
"At first it bothered me to buy tools from a non-USA tool company, but I'll admit these things rock."
"Perfect cut for my X pipe install on c5 convertible, remember let the tool do the work, don’t squeeze it like a gorilla and u witll get a perfect cut."
"Just wrap the chain around the pipe and attach it to the lug on the handles."
"I DIDN'T THINK I WOULD HAVE USED THIS MUCH AFTER I DID A CUSTOM EXHAUST FOR MY 1 YEAR OLD NEW DODGE TRUCK, BUT HAVE USE THIS SOME OF MY SON'S VEHICLES AND THEIR FRIENDS VEHICLES."
"I wasn't expecting this thing to cut my 3 inch exhaust as fast and cleanly as it did."
"Tried using it to cut new exhaust in my garage."
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