--- product_id: 389594817 title: "Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1" brand: "chamberlain" price: "MX$104" currency: MXN in_stock: false reviews_count: 5 url: https://www.desertcart.mx/products/389594817-chamberlain-820cb-replacement-garage-door-safety-sensor-2-pk-quantity store_origin: MX region: Mexico --- # Bright LED indicators for easy alignment Fits all Chamberlain openers post-1997 Includes mounting brackets & extension wire Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 **Brand:** chamberlain **Price:** MX$104 **Availability:** ❌ Out of Stock ## Summary > 🚪🔒 Elevate your garage safety game with sensors that never miss a beat! ## Quick Answers - **What is this?** Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 by chamberlain - **How much does it cost?** MX$104 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/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 - • **Low-Profile Design:** Sleek sensors minimize misalignment risks and blend discreetly into your garage setup. - • **Trusted Durability:** Backed by 4.6-star reviews and engineered for long-lasting, reliable performance. - • **Universal Compatibility:** Seamlessly works with Chamberlain, LiftMaster & Craftsman openers for hassle-free upgrades. - • **Complete Installation Kit:** Comes with sensors, brackets, 18-inch extension wire, and clear instructions—DIY made effortless. - • **Precision Safety Reversal:** Automatically reverses your garage door at the slightest obstruction—because safety can’t wait. ## Overview The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack offers universal compatibility with all Chamberlain garage door openers made after 1997, plus LiftMaster and most Craftsman models. Featuring bright LED indicators and a low-profile design, these sensors ensure precise alignment and automatic door reversal upon obstruction. The package includes mounting brackets, 18 inches of extension wire, and an instruction manual for easy installation, delivering trusted, durable safety backed by excellent customer reviews. ## 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: Buena compra - 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: Perfect replacement, saved me about $200 by replacing the sensors myself. - 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. ## 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 | | Brand | Chamberlain | | Customer Reviews | 4.6 out of 5 stars 774 Reviews | | Global Trade Identification Number | 00012381197460 | | Included Components | 2-sensors, mounting brackets, 18 in. of extension wire, instruction manual | | Item Dimensions | 8 x 11.4 x 16.5 centimetres | | Item Type Name | Garage Door Safety Sensors | | Item dimensions L x W x H | 8 x 11.4 x 16.5 centimetres | | Manufacturer | CHAMBERLAIN CORP | | Manufacturer Part Number | 820CB | | Material | Plastic | | Model Number | 820CB | | Mounting Type | Bracket | | Mounting type | Bracket | | Number of Items | 1 | | Specific Uses For Product | garage door safety detection | | Specific uses for product | garage door safety detection | | Style | Sensors | | Style Name | Sensors | | UPC | 012381197460 | | Unit Count | 1.0 count | ## 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) ## 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 ### ⭐⭐⭐⭐⭐ Buena compra *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. ### ⭐⭐⭐⭐⭐ Perfect replacement, saved me about $200 by replacing the sensors myself. *by J***W on 2 December 2025* 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. ### ⭐⭐⭐⭐⭐ Great sensor *by D***L on 10 July 2023* Works with my Liftmaster garage door opener. The included wire clips were helpful for attaching new sensors’ wires to the original wires from the old sensors. The LED indicators on each sensor are bright and easy to see. ## Frequently Bought Together - Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1 - 100 Feet Universal Garage Door Wire 2 Conductor Bell Wire Fits for Control Station/Sensors,24/2 AWG - 41A5034 Safety Sensor Kit, Replacement for Craftsman/Chamberlain/Liftmaster Garage Door Sensor, Compatible with Liftmaster/Chamberlain/Craftsman Garage Door openers Made After 1997 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.mx/products/389594817-chamberlain-820cb-replacement-garage-door-safety-sensor-2-pk-quantity](https://www.desertcart.mx/products/389594817-chamberlain-820cb-replacement-garage-door-safety-sensor-2-pk-quantity) --- *Product available on Desertcart Mexico* *Store origin: MX* *Last updated: 2026-08-22*