The 977LM is a wireless keyless entry system featuring Security+ Anti-Burglary Coding and rolling code technology that generates over 100 billion possible codes to prevent unauthorized access. Mount it directly to your garage door jamb with two screws for convenient keypad entry without requiring a remote control. It supports temporary access codes for guests and service personnel, and is compatible with garage door openers manufactured from 1997 to present, including Chamberlain remote models 950CB, 953CB, and 956CB.