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 operates with 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 features Security+ 2.0 rolling code technology to synchronize with your existing opener frequency, helping prevent radio wave interference. It has been strictly tested using professional equipment. The keypad has 3 channels, allowing control of up to 3 separate garage door openers with one device. Designed for compatibility 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. A protective cover helps guard against environmental 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 Type: Rolling code Battery: Built-in 9V carbon battery Working Voltage: 3V Working Current: ≤12mA Transmission Distance: Up to 100 meters (in open area) Operation: Functions like the original remote; must be paired with the main unit Color: As shown Material: Plastic Package Contents: 1 x Remote Control 1 x Battery 2 x Screws/Nuts Note: The package includes only the items listed above. Other products are not included. Lighting and display differences may cause slight color variations between the image and the actual product. Measurement tolerance: ±1–3 cm.