LiftMaster by Chamberlain 315MHz Wireless Keypad 377LM Security+ rolling code technology assures a new code is sent every time the keypad is used Temporary password option enables friends or service people to enter the garage Completely wireless - powered by one 9-volt battery (included), weatherproof flip-up protective cove Works only on 315 MHz frequency and ONLY WORKS WITH PURPLE LEARN BUTTONS on motor head under light C Backlit keypad makes numbers easy to see, even in the dark, one-button-to-close feature makes it easy