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 designed to control up to three motor units, making it versatile for multiple garage doors. 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) Compatibility and accessories Compatible with 1993 garage door remotes with yellow, red, orange, or green learning buttons Replacement for models: 877MAX, G940EV-P2, 878MAX, 377LM, 977LM, 877LM, 66LM, CMXZDCG440 Not compatible with: 200.57933, 57943, 57953 Series, 100 CR1150, 139.57943, 139.57953 Installation Wireless installation and programming Pairs with the host computer