The Door Wireless Chamberlain LiftMaster Opener Keypad 877MAX Garage is a remote control device compatible with LiftMaster and Chamberlain garage door openers. It operates using Lithium-Ion battery technology with a range of 100 ft. The remote features three buttons, including universal compatibility and illuminated buttons for convenience. It includes a battery and is designed with PVC material, making it durable for everyday use. The model is Liftmaster 877MAX with a frequency of 315 MHz, suitable for various garage door opener models.