Power supply board 250W, 20A/12V or 10A/24V. Secondary voltage power supply, 5-18V adjustable @ 4A max, class 2 power limited output. 8 relay lock control outputs class 2 power limited at 2.5A per output. 8 auxiliary DC outputs class 2 power limited at 2.5A per output. Enclosure 20W x 24H x 4.5D with Mercury/Lenel backplate and door mount option