[Compatibility] 877LM Wireless Garage Door Keypad is compatible with liftMaster/chamberlain/craftsman garage door openers manufactured from 2011 to current, work for openers Security + 2.0 (Yellow Learn Button)..[Absolute Security] 877LM Keyless Keypad features the latest security+ 2.0 rolling Code Technology to reduce radio wave interference..[Wireless and Keyless Entry] 877LM Garage Door keypad is completely wireless, which is powered by battery (included). You can open or close your garage door without using a remote control or key..[Installation] You can easily install 877LM Garage Door keypad on your own. Please close your garage door before starting the program. Once started, do stay close to the gate opener and do the program according to the instruction as quick as possible to avoid failure due to time out..[Money Back Guarantee] We provide a one-year warranty service for 877LM Wireless Keypad. For any reason you're not completely satisfied with the product, you can ask for a replacement or full refund. Note: Accessories are compatible spares (non-original), the above brand names and any related model names are only used to demonstrate compatibility.