Replacement Safety Sensors for Garage Door Opener Sku: CHA-820CB-HD This is a brand new part comes with a full manufacturer warranty!!! This sale transaction is for only this part number: 820CB 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: Compatible with Chamberlain, lift master and most craftsman For use with every Chamberlain garage door Use: replacement for damaged sensors Easy installation Enhanced trouble shooting, 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 2-sensors, mounting brackets, 18 in. of extension wire, instruction manual Click here for more information on Electronic Recycling Programs TERMS OF SALE: If, after receiving this item you discover that it was not the one you wanted, simply return it for a full refund within 30 days. You will have to pay for the return shipping charges. Refund is void if you have installed, used or damaged the item in any way. Item must be returned with its original box, packing materials and instructions. Payment via PayPal must be received within 3 days of transaction and prior to shipping. SHIPPING: Shipping charge will be based upon location. Please use the shipping calculator or request a shipping quote. International buyers: Customs fees, duties, taxes, tariffs other fees are your responsibility. Arrival time will depend on your location. If you have any questions, feel free to ask. Thank you for visiting! Weight:7.0000~SCID:179688~Dimension:6.000x7.000X8.000