---
product_id: 389594817
title: "Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1"
brand: "chamberlain"
price: "S/.404"
currency: PEN
in_stock: true
reviews_count: 5
category: "Chamberlain"
url: https://www.desertcart.pe/products/389594817-chamberlain-820cb-replacement-garage-door-safety-sensor-2-pk-quantity
store_origin: PE
region: Peru
---

# Compact low-profile design Automatic door reversal on obstruction Universal compatibility & easy install Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1

**Brand:** chamberlain
**Price:** S/.404
**Availability:** ✅ In Stock

## Summary

> 🚪🔒 Elevate your garage’s safety game with smart, sleek sensor tech!

## Quick Answers

- **What is this?** Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 by chamberlain
- **How much does it cost?** S/.404 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/products/389594817-chamberlain-820cb-replacement-garage-door-safety-sensor-2-pk-quantity)

## Best For

- chamberlain enthusiasts

## Why This Product

- Trusted chamberlain brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Sleek, Low-Profile Build:** Designed to minimize risk of misalignment or damage, these sensors blend effortlessly into your garage setup without bulky hardware.
- • **Complete Installation Kit:** Includes two sensors, mounting brackets, 18 inches of extension wire, and a clear instruction manual for a hassle-free DIY upgrade.
- • **Plug & Play Compatibility:** Works flawlessly with all Chamberlain openers post-1997, plus LiftMaster and most Craftsman models—no guesswork, just reliable performance.
- • **Enhanced Sensor Sensitivity:** Upgraded LED indicators and improved accuracy mean fewer false triggers and smoother garage door operation every time.
- • **Seamless Safety Integration:** Projects an invisible beam to instantly detect obstructions, ensuring your garage door reverses automatically to prevent damage or injury.

## Overview

The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack offers a low-profile, highly sensitive safety solution compatible with all Chamberlain garage door openers made after 1997, as well as LiftMaster and most Craftsman models. Designed to automatically reverse the door upon detecting obstructions, these sensors come with mounting hardware and extension wire for easy installation, ensuring enhanced safety and reliability in your home’s garage.

## 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.

Review: Los sensores anteriores ya no funcionaban correctamente, decidí cambiarlos por estos, tengo motor chamberlain y funcionaron excelente, muy fácil la instalación sin necesidad de contratar técnico.
Review: Installs onto existing wire. Will require wire strippers for the install. Package provides 4 (+1 extra) crimp connectors for making the connection between the new sensors and the old cables. Old sensors were having some issues (backing up when nothing was there, not stopping when something was actually blocking the sensor). These seem to be more sensitive and accurate than the older sensors. I did not bother changing the mounting hardware and used the existing ones on the track. New LED indicators are much brighter and larger.

## 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09GB6JHRR |
| Batteries Required? | No |
| Batteries included? | No |
| Customer Reviews | 4.6 4.6 out of 5 stars (739) |
| Date First Available | 15 Sept. 2021 |
| Global Trade Identification Number | 00012381197460 |
| Included Components | 2-sensors, mounting brackets, 18 in. of extension wire, instruction manual |
| Item Package Quantity | 1 |
| Item Weight | 290 g |
| Item model number | 820CB |
| Manufacturer | CHAMBERLAIN CORP |
| Number of pieces | 2 |
| Part Number | 820CB |
| Product Dimensions | 5.28 x 2.9 x 3.15 cm; 290 g |
| Recommended uses for product | Preventing accidents and reversing garage doors upon obstruction |
| Size | 1 |
| Specification met | UL |
| Style | Sensors |
| UPC | 012381197460 |

## Product Details

- **Brand:** CHAMBERLAIN
- **Colour:** Black
- **Exterior finish:** Black
- **Installation type:** Screw-In
- **Material:** Metal

## Images

![Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 - Image 1](https://m.media-amazon.com/images/I/51dXnQ5v-SL.jpg)
![Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 - Image 2](https://m.media-amazon.com/images/I/51rsOjXthHL.jpg)
![Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 - Image 3](https://m.media-amazon.com/images/I/61vNkDmmLXL.jpg)
![Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 - Image 4](https://m.media-amazon.com/images/I/71-bVEhCJdL.jpg)
![Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 - Image 5](https://m.media-amazon.com/images/I/61JuHHBRq3L.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: remote open the door but wont close it  keep coming back up, but i can close it from the inside ,do you think this will solve the problem ?liftmast**
A: If you're able to close the door by holding down the button on the wall , then yes. However, it could be bad wiring ... maybe a bad connection. I see lots of time people use electrical tape and the adhesive actually breaks the connection over time. Try resplicing the connections if they are spliced first. If there is no splice, then it's possible the eyes are bad. To test them... use a newer 9volt battery. Detach both of the sensors and connect the matching wires together. Connect the wire with the black line to the positive side and the white to the negative. Line them so they are facing each other. If both lights come on then it's not the eyes. Could be a bad wire that is pinched or a bad circuit board on the motor unit. Good luck.

**Q: do these sensors come with wires attached to them ?**
A: 3 foot pigtails. You'll need to have wire from your opener to these and then splice them.

**Q: will they work for a craftsman opener ?**
A: Yes, I used my with a Craftsman and it worked perfect.

**Q: Could I use this sensor to light up a light when the sensor is activated?**
A: No. it has a circuit board in the door opening. It is not working like a switch but if the light is already on the garage door opener then that light will come on

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by J***E on 7 March 2022*

Los sensores anteriores ya no funcionaban correctamente, decidí cambiarlos por estos, tengo motor chamberlain y funcionaron excelente, muy fácil la instalación sin necesidad de contratar técnico.

### ⭐⭐⭐⭐⭐ Review
*by S***4 on 4 April 2022*

Installs onto existing wire. Will require wire strippers for the install. Package provides 4 (+1 extra) crimp connectors for making the connection between the new sensors and the old cables. Old sensors were having some issues (backing up when nothing was there, not stopping when something was actually blocking the sensor). These seem to be more sensitive and accurate than the older sensors. I did not bother changing the mounting hardware and used the existing ones on the track. New LED indicators are much brighter and larger.

### ⭐⭐⭐⭐⭐ Review
*by M***N on 4 August 2023*

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!

## Frequently Bought Together

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*Product available on Desertcart Peru*
*Store origin: PE*
*Last updated: 2026-03-15*