WIDE COMPATIBILITY: This wireless garage door keypad is compatible with Liftmaster, Chamberlain, Wayne Dalton, and Sears Craftsman garage door openers with purple yellow red orange green learn buttons from 1993 to present. Does not work with Craftsman 200.57933 57943 57953 Series 100 CR1150 139.57943 139.57953, Models whose connection protocol is Wi-Fi are not currently supported! | KEYLESS GARAGE ENTRY: This garage door opener key pad is a secure keyless entry system that opens or closes your garage door without the use of a remote or key. The wireless keyless entry system opens your garage door using a 4-digit private code that you program directly into the device. Replacement 877MAX G940EV-P2 878MAX 377LM 977LM 877LM 66LM CMXZDCG440 | EASY TO INSTALL AND USE: The keyless entry system offers wireless installation and wireless programming. A rain cover is included. Large backlit buttons on the keypad provide quick and easy access. Offers a one-touch closing feature that makes closing the garage door easier than ever | SECURE AND RELIABLE: This garage door keypad features the latest Security+ 2.0 rolling code technology that easily synchronizes with existing door opener frequencies to eliminate radio wave interference. Rigorously tested using specialized test equipment. This keypad has 3 channels for 3 door openers, so you can control up to 3 motor units with just one keypad.Temporary Password: Can be provided to maintenance personnel, meter readers, house sitters, etc. while you are away without revealing your family's private entrance code. | After-sales service promise: If you are not sure if the product is right for you, please tell us through our store homepage "Ask a question" or support email. If you are not satisfied with the product for any reason, please tell us and we will resolve the issue for you. We can even provide you with a new product - no questions asked!