General description This Garage Door Opener Keypad is a secure wireless keyless entry system that allows you to open or close your garage door without the need for a remote or key. It features a dedicated 4-digit code that can be programmed directly into the unit, providing convenience and security. The keypad is compatible with various models, including 877MAX, 377LM, 977LM, and more, and utilizes the latest Security+ 2.0 rolling code technology to minimize radio wave interference. Technical specifications 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) Material: Plastic Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with 1993 garage door remotes with yellow-red-orange-green learning buttons Replacement for models: 877MAX, G940EV-P2, 878MAX, 377LM, 977LM, 877LM, 66LM, CMXZDCG440 Package Contents: 1 x Remote Control, 1