This rugged, metal companion device is weather-resistant and works with all gate openers equipped with a USAutomatic receiver. Power can be supplied with the included CR123 internal battery or hard wired to a 12 Vac/Vdc source. Battery life ~24 months and optional 2nd battery may be installed. Features Include: Rugged Die-Cast Locking Aluminum Cover 256 Access Codes 256 Temporary Access Codes programmable for 1 to 9 uses Hold Open access code Radio Transmission 433.92 mhz Keypad locks out for 60 seconds after 7 incorrect access codes