Introducing the Norton Rixson 998M 689 Electromagnetic Door Holder in a sleek silver finish, designed for seamless wall mounting. This innovative door holder features concealed wiring for a clean look and a total projection of 3-5/8 inches, ensuring it fits perfectly in your space. It requires a standard 2" x 4" x 1-3/4" outlet box for installation and operates on tri-volt power (120VAC, 24VAC/DC, 12VDC). With a robust holding force of 25-40lbs, it guarantees fail-safe operation, allowing the door to close during power failures. The door remains open until released by an alarm or smoke detector, providing safety and convenience. Upgrade your door security today with this reliable electromagnetic holder!