Use this weather-resistant keypad to build a powerful keyless entry system! The unit features one input for a door position magnetic contact (sold separately) and 4 relay outputs. Lock relay contacts can be set to close between 1 and 90 seconds, to latch or to relock as soon as the door is closed again. Units flush-mount in standard single-gang wall switch box. Tamperproof tri-head mounting screws incl. Requires 12 or 24 volts, AC or DC power supply (sold separately). Weather-Resistant Programmable Keypad features programmable contact closure duration.