Magnetic lock has an actual 280KG (600Lbs) straight line pull, which attracts the attached iron plate to lock the door. With double sensor, like lock sensor (NO NC COM) and door sensor (NO NC COM). When the door is closed, the iron piece absorbs the lock body, the lock is normally locked, and the indicator light turns from green light to red light; the normally closed end NC is disconnected from COM. Dual voltage 12/24V can be adjustable, it built in MOV device to protect reverse current, it is aluminum alloy material and CE and UL approves.