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 using a dedicated 4-digit code programmed directly into the unit. Compatible replacement for models including 877MAX, G940EV-P2, 878MAX, 377LM, 977LM, 877LM, 66LM, and CMXZDCG440. This garage door keypad features Security+ 2.0 rolling code technology to synchronize with your existing opener frequency, helping prevent radio wave interference. Tested using professional equipment. Supports up to three garage door openers via three independent channels. Compatible with garage door openers manufactured from 1993 onward featuring purple, yellow, red, orange, and green learning buttons. Not compatible with models in the 200.57933, 57943, 57953, Series 100 CR1150, 139.57943, or 139.57953 families. Keyless entry enables wireless installation and wireless programming. Large backlit buttons allow easy input in low-light conditions. Includes a protective cover resistant to rain splashes. Features one-touch closing functionality. Product Name: Garage Door Opener Keypad Model Number: 877MAX Frequency: 310 / 315 / 390 MHz Code Type: Rolling code Battery: Built-in 9V carbon battery Operating Voltage: 3 V Operating Current: ≤ 12 mA Transmission Distance: Up to 100 meters (in open area) Operation: Requires pairing with compatible garage door opener Color: As shown Material: Plastic Package Contents: 1 x Garage Door Opener Keypad 1 x Battery 2 x Screws/Nuts Note: Colors may vary slightly due to screen settings and lighting conditions. Dimensions may vary by ±1–3 cm.