This electric magnetic lock consists of an electromagnet and an armature plate used for access control door locks. By attaching this to the door frame and the armature plate to the door, a current passing through the electromagnet attracts the armature plate, holding the access control door lock shut. When power off, the door will open. It is suitable for wooden door, glass door, metal door, fire-proof door,etc. Features:Secure NC mode: unlocked when power off, locked when power on. Suitable for: wooden door, glass door, metal door, fire-proof door. Anti magnetic design, wear resistant material manufacturing. High quality electromagnetic material vacuum treatment, double lock body insulation treatment. The aluminum housing is made of high strength alloy and anodized. Comply with environmental protection requirements, low power consumption, super quiet design, no noise during operation.Specifications:Locking Mode: NCWorking Voltage: DC 12VWorking current: 12V/320mAMaterial: Aluminum alloy shell + iron plateHolding Force: 280kg(600Lbs) Lock Size: Approx. 22.6*3.9*2.8cm/ 8.9*1.5*1.1in Plate Size: Approx. 18.1*3.8*1.2cm/7.1*1.5*0.5inPackage Weight: Approx. 1700g/60ozPackage List:1* Magnetic Door Lock1* Mounting Kit1* User ManualNote:1. This product produces a larger magnetic field when working. Do not approach the magnetic sensitive element.2. The working voltage is 12VDC. If 24VDC is used, the temperature of the lock body will be too high or the control circuit will be damaged.3. Be careful to check and remove foreign body between lock body and magnetic iron block in time to maintain good suction..