--- product_id: 372019211 title: "Chamberlain 820CB Garage Door Safety Sensor Replacement, 2-Pack | Works with all garage openers made after 1997, Includes brackets and 18 in wire, Auto-reverses on obstruction" brand: "chamberlain" price: "334 zł" currency: PLN in_stock: true category: "Chamberlain" url: https://www.desertcart.pl/products/372019211-chamberlain-820cb-garage-door-safety-sensor-replacement-2-pack-works store_origin: PL region: Poland --- # 18-inch extension wire for flexible installation Automatic door reversal on obstruction Compatible with Chamberlain, LiftMaster & Craftsman Chamberlain 820CB Garage Door Safety Sensor Replacement, 2-Pack | Works with all garage openers made after 1997, Includes brackets and 18 in wire, Auto-reverses on obstruction **Brand:** chamberlain **Price:** 334 zł **Availability:** ✅ In Stock ## Summary > 🚪🔒 Elevate your garage safety game with invisible tech that has your back! ## Quick Answers - **What is this?** Chamberlain 820CB Garage Door Safety Sensor Replacement, 2-Pack | Works with all garage openers made after 1997, Includes brackets and 18 in wire, Auto-reverses on obstruction by chamberlain - **How much does it cost?** 334 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/372019211-chamberlain-820cb-garage-door-safety-sensor-replacement-2-pack-works) ## 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 - • **Dual Sensor Pack:** Includes 2 sensors plus mounting brackets and extension wire for complete setup - • **Low-Profile Design:** Sleek sensors minimize misalignment risk and maintain garage aesthetics - • **Trusted Compatibility:** Works flawlessly with top brands ensuring peace of mind and easy replacement - • **Seamless Safety Integration:** Fits all Chamberlain openers post-1997 for effortless upgrade - • **Invisible Protection Barrier:** Projects a precise light beam to prevent accidents before they happen ## Overview The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack offers advanced, low-profile sensors that automatically reverse your garage door upon detecting obstructions. Compatible with Chamberlain openers made after 1997, as well as LiftMaster and most Craftsman models, this kit includes two sensors, mounting brackets, and an 18-inch extension wire for flexible installation. Rated 4.6 stars by 800 users, it ensures reliable, accident-preventing performance backed by a 1-year warranty. ## 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. ## 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 | | Best Sellers Rank | #40,030 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #14 in Garage Door Sensors | | Brand Name | CHAMBERLAIN | | Customer Reviews | 4.6 4.6 out of 5 stars (800) | | Global Trade Identification Number | 00012381197460 | | Included Components | 2-sensors, mounting brackets, 18 in. of extension wire, instruction manual | | Item Dimensions | 3.13 x 4.5 x 6.5 inches | | Item Type Name | Garage Door Safety Sensors | | Manufacturer | CHAMBERLAIN CORP | | Material Type | Plastic | | Model | 820CB | | Mounting Type | Bracket | | Part Number | 820CB | | Specific Uses For Product | garage door safety detection | | Style Name | Sensors | | UPC | 012381197460 | | Unit Count | 1.0 Count | | Warranty Description | 1-year warranty | ## Product Details - **Brand:** CHAMBERLAIN - **Item dimensions L x W x H:** 3.13 x 4.5 x 6.5 inches - **Material:** Plastic - **Mounting Type:** Bracket - **Style:** Sensors ## Images ![Chamberlain 820CB Garage Door Safety Sensor Replacement, 2-Pack | Works with all garage openers made after 1997, Includes brackets and 18 in wire, Auto-reverses on obstruction - Image 1](https://m.media-amazon.com/images/I/51dXnQ5v-SL.jpg) ## Available Options This product comes in different **Size, 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 ## 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.pl/products/372019211-chamberlain-820cb-garage-door-safety-sensor-replacement-2-pack-works](https://www.desertcart.pl/products/372019211-chamberlain-820cb-garage-door-safety-sensor-replacement-2-pack-works) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-08-01*