The GTO / Linear AK11 digital keypad can hold up to 120 codes for accessing your facility or home. It is powered by a 12-24V AC or DC source. Options include opening codes of 1 to 6 digits. Also has a hold open function which is handy for those days you would like the gate to stay open for an extended period or for expected deliveries. LED illuminated keypad. Rugged cast aluminum housing.