Our Garage Door Remote Receiver Keypad is a secure wireless keyless entry system that opens or closes your garage door without the use of a remote or key. The system can open the door using a dedicated 4-digit code programmed directly into the unit. Compatible with models 877MAX, G940EV-P2, 878MAX, 377LM, 977LM, 877LM, 66LM, CMXZDCG440. This garage door keypad uses Security+ 2.0 rolling code technology to synchronize with your existing opener frequency, helping to prevent radio wave interference. Tested with professional equipment. The keypad has 3 channels, allowing control of up to 3 garage door openers with one unit. This wireless garage door keypad is compatible with garage door remotes from 1993 featuring purple, yellow, red, orange, and green learning buttons. Not compatible with models 200.57933, 57943, 57953, Series 100, CR1150, 139.57943, 139.57953. Keyless entry allows for wireless installation and programming. Large backlit buttons enable easy access in low light. The protective cover helps guard against weather elements. Includes one-touch closing function for convenient operation. Convenient Design: Backlit buttons for easy input in the dark. Protective cover resists rain splashes. Product Name: Garage Door Opener Keypad Item No.: 877MAX Frequency: 310/315/390 MHz Code: Rolling code Battery: Built-in 9V carbon battery Working Voltage: 3V Working Current: ≤12mA Transmitting Distance: 100 meters (open area) Operation: Programmable to work with compatible garage door openers, pairing required with the main unit. Color: As shown Material: Plastic Package Contents: 1 x Remote Control 1 x Battery 2 x Screws/Nuts Note: Light reflection and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.