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 control or key. The system can open the door using a special 4-digit code programmed directly into the device.Replacement for 877MAX G940EV-P2 878MAX 377LM 977LM 877LM 66LM CMXZDCG440 This garage door keypad uses the latest Security+ 2.0 rolling code technology to sync with your existing opener frequency, eliminating interference with radio waves. Rigorously tested using professional test equipment. The garage door keypad has 3 channels connected to three openers, one keypad controls up to 3 motor units Keyless entry provides wireless setup and wireless programming. Large backlit buttons allow for quick and easy access in the dark. Protective cover protects against the elements. Provides a one-touch closing function to easily close the garage door Convenient design: illuminated buttons for quick and easy entry in the dark. Protective cover protects against rain splashes. Product Name: Garage Door Opener Keypad Item No.: 877MAX Frequency: 310/315/390Mhz Code:Rolling Code Battery: Built-in battery 9V carbon battery Working voltage: 3V Working current: less than equal to 12mA Transmission distance:100 meters (open) Operation: Same as the old remote, must be paired with the host computer Color: As shown Material: Plastic Package Contents: 1 x Remote Control 1 x Battery 2 x screws/nuts Only the above package contents, other products are not included. Note: Light reflection and different views may cause the color of the item in the photo to be slightly different from the real thing. The permissible measurement error is +/- 1-3 cm.