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Availability:
In Stock.
Arrives
Tuesday, Oct 20
Style: Sensors
Features
- For use with every Chamberlain garage door opener manufactured after 1997
- Enhanced troubleshooting, most intuitive safety reversing sensors
- Low profile reduces risk of being knocked out of alignment
- Whenever there is an obstruction, the garage door will automatically reverse
- Compatible with Chamberlain, LiftMaster and most Craftsman garage door openers
- Includes 2 sensors, mounting brackets, 18 inches of extension wire, instruction manual
Description
The Replacement Safety Sensors project an invisible light beam across the inside of the garage door to prevent accidents and are required for safe use of all Chamberlain Garage Door Openers. Whenever there is an obstruction, the garage door will automatically reverse before causing any damage. Chamberlain compatible, these sensors replace defective or damaged sensors for every Chamberlain Garage Door Opener manufactured after 1997.
Brand: CHAMBERLAIN
Item dimensions L x W x H: 3.13 x 4.5 x 6.5 inches
Material: Plastic
Style: Sensors
UPC:
Brand Name: CHAMBERLAIN
Model: 820CB
UPC: 012381197460
Number of Items: 1
Global Trade Identification Number: 60
Manufacturer: CHAMBERLAIN CORP
Item Highlight: Works with all garage openers made after 1997, Includes brackets and 18 in wire, Auto-reverses on obstruction
Warranty Description: 1-year warranty
Unit Count: 1 Count
Included Components: 2-sensors, mounting brackets, 18 in. of extension wire, instruction manual
Item Type Name: Garage Door Safety Sensors
Part Number: 820CB
Material Type: Plastic
Style Name: Sensors
Item Dimensions: 3.13 x 4.5 x 6.5 inches
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Oct 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Size: Small
Style: Sensors
I was having intermittent issues with my Jackshaft Liftmaster garage door opener not being able to close. When I tried to close it, it would move a couple of inches, but it would reverse since the old safety sensors erroneously thought there was an obstruction. I contacted my garage door guy who installed it 13 years ago and he suggested replacing the safety sensors as a possible solution. This was the easiest, cheapest, and most cost-effective repair to try. My existing safety sensors did not give me any indication of failure like blinking lights. I would never have suspected that the safety sensors was the problem. These safety sensors are a little smaller than my old ones, but these worked just fine and are perfect replacements. I was able to use the existing mounting hardware, so installation was super easy. Just splice the matching-colored wires and adjust the sensors so they are aligned. All the parts that you need are included, even the wire connectors. They even provided an extra wire connector that I needed because I didn't crimp one of the connectors properly. It took me less than 45 minutes even with clean up, but I am sure others can do in 15 to 30 minutes. I took my time, since I didn't want to make any mistakes. If I called a professional to do the replacement, the sensor would have cost me $75 and the service call and labor would have been about $150 or so. Beware of unscrupulous garage door companies who want you to spend thousands of dollars on a garage door refresh (replacing all the hardware of the garage door like rollers, cables, spools, springs, etc.) and/or replacing the garage door opener itself that isn't needed. I am lucky to have an honest garage door installer that helped and saved me money. I asked him if I needed to replace any hardware and he said no, unless I just wanted to spend money. This is definitely an easy DIY project which saves you a lot of money for something that is so easy to do. I expect these sensors to be durable and last me over ten years like my old ones.
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Reviewed in the United States on December 2, 2025 by JW
Size: Small
Style: Sensors
I had new garage doors installed about 3-4 years ago and they functioned perfectly (including the safety sensors) from day one. Unfortunately, we recently starting having problems with the garage doors closing in the later afternoon (North facing driveway). It was pretty clear that the sun was shining directly into the safety sensors which caused the lift motor to reverse. This was a major problem as I have a few kids who are great on their iPhones but not so great when it comes to more "complicated" home problems (i.e. running a dishwasher, washing machine, lawn mower, and garage doors). It is really frustrating to be at work and have a kid call to say they can't get the garage doors to close. It is even more frustrating to try to explain how to solve the problem to the helpless teenagers.....Enough said. Time to solve the problem. I did lots of internet research and found all kinds of hokey solutions (i.e. toilet paper roll, black plastic sun shades, etc...) but none of those seemed reliable enough to protect me from the dreaded call from the teenagers so I looked into the problem further and it appears that long-term exposure to sunlight can cause the older generation of photoelectric safety sensors to deteriorate. I decided to replace the old sensors with these hoping it would solve the problem. Good news! They did! I do have a couple of tips that might help with the install if you choose to replace your old sensors with these. First, I used a black permanent marker to mark the top location of the brackets for the old sensors. I then removed the old brackets and installed the new brackets with the new sensors as a complete assembly with the top of the new bracket at the marked line. That is much easier than installing the new bracket and then installing the new sensor (you do need to use the new bracket as the sensors are shaped differently). Next, I pre-wound some of the excess wire around a pen to create a little buffer in case I needed to move the new sensor up or down. It is only possible to do this easily if you do it before the wires from the sensor are connected to the wires from the garage door motor. I now had a buffer that would allow vertical movement if my marks were off. Finally, I cut the old sensor out one wire at a time so that I did not have to unplug the garage door motor itself. If you cut one wire at a time, you cannot create a short which might damage the garage door motor and unplugging the motor itself is an unnecessary extra step. The connectors that are included with the new sensors were perfect and easily secured with a simple pliers so all good! Once the install and electrical connections were complete, it was easy to verify the sensors were properly aligned. One sensor has an amber light and the other has a green light. It does not appear to matter how you install them. Both lights are constantly on when things are properly aligned and they flash if there is a problem so easy to verify the install. Mine turned out to be correct so I went on to test the up/down performance at the same time of day when we usually have trouble. Everything worked perfectly and I no longer have problems with the sunlight causing the garage doors to reverse! These turned out to be a simple solution to a frustrating problem. I highly recommend the kit if you are having similar problems with your garage doors auto reversing due to sunlight!
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Reviewed in the United States on August 4, 2023 by MN Outdoorsman
Size: Small
Style: Sensors
My garage door stopping closing when the outside temps got colder, so research led me to replacing the sensors. I checked the opener's manufacturing date, and it was 2005, so I then checked reviews for that version of the sensors and didn't see much difference in ratings or performance for the cheaper generic ones so that is what I first bought. Turns out that the previous homeowner replaced the opener in 2005 but reused the older pre-1997 sensors! Different size and connection and everything. But when the generic ones arrived, I thought let's try 'em and see. Massive logistics issues - no way to mount the new sensor brackets at 6 inches or lower due to 8" concrete foundation, and they didn't fit in the older and larger existing brackets which were firmed drilled into said concrete foundation. I got the new ones installed in the new brackets at 10" height above floor but had the receiving sensor on the sunlight side, so I switched them. They never hooked up and the light indicating power and version was so small and dim that it was a frustrating experience. Next step was to try these sensors designed for this 2005 opener. Best decision ever. These Chamberlain sensors (our opener is a Liftmaster) are smaller than the generic ones but were much easier to install on the newer brackets that came with them, and much easier to align. Having 24" of wiring instead of 16" helped in that regard. But the two keys for me were the fact that the receiving sensor (green light) was clearly labeled, and once installed those larger brighter colored lights were a Godsend in a dark garage. These are well worth the extra money compared to the cheaper generic ones, and if you are a DIY type who gets easily frustrated then you definitely need these.
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Reviewed in the United States on October 18, 2024 by Jazz Dude
Size: Small
Style: Sensors
Super easy to install and works great.
Reviewed in the United States on September 15, 2026 by JR
Size: Small
Style: Sensors
All the parts you need are included in the box: -Clips -Sensors -Screws -Wire connectors The setup is very easy and took me about 20 minutes from start to finish. You will need to strip the wires yourself, but the installation is straightforward and requires only a wire stripper/cutter and a screwdriver. Helpful tip: Before cutting the straight wires attached to the sensors, wrap them around a pencil or pen to create a small coil. This gives you some extra wire to work with if you need it during installation. (See picture). I installed these on a LiftMaster garage door opener, and they worked perfectly. Alignment is simple: Measure the same distance up from the floor on both sides of the garage door and install the clips at the same height. Then attach the sensors to the clips. A flashing green light indicates that the sensors are not aligned, while a solid green light means they are properly aligned. Overall, it was a quick, straightforward installation, and everything worked exactly as expected.
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Reviewed in the United States on August 13, 2026 by SOMO
Size: Small
Style: Sensors
I had the older sensors and had issues with sunlight keeping my garage door from shutting. Replaced it with these and no more issues so far. The orange/green notficiation light is significantly brighter as well and makes it easier to see if something is blocking the laser. My only issue is that there was absolutely no instructions. It's pretty simple to install but some sort of guidance on how to install them would have helped. Also the cable connectors they have in the box are trash.
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Reviewed in the United States on July 17, 2025 by Bizzle
Size: Small
Style: Sensors
Easy install. Cable could be a little longer but made it work. Just like the factory ones
Reviewed in the United States on July 7, 2026 by kobe
Size: Small
Style: Sensors
My old sensors started being weird. Pros: These were easy to install. I used the old brackets, so one less step that way. Visible lights to show it is aligned which is an upgrade over my old sensors, and it blinks when misaligned. Cons: Comes with no instructions. Also probably overpriced to buy the Chamberlain branded item.
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Reviewed in the United States on September 1, 2026 by Caveat Emptor