Features AUTOMATIC DOOR HOLDER: Electromagnetic door holder power supply is 24V, the body and sub body of the door stop will be closed and demagnetized after power failure. FINE WORKMANSHIP: This electromagnetic door holder is exquisite workmanship, fashionable and generous, and can perfectly match various home styles. ZINC ALLOY MATERIAL: This electromagnetic door holder is made of zinc alloy, strong and durable, with a suction power of 55Kg. ENSURE SAFETY: This electromagnetic door holder can keep the door open and ventilated during normal times, and will close the door on its own during a fire to keep out smoke and fire. PURE COPPER COIL: This electromagnetic door holder is lined with pure copper coils, which have good conductivity and load bearing capacity and long service life. Specification: Item Type: Electromagnetic Door Holder Material: Zinc alloy Color: Silver Working Voltage: DC24V Working Current: 80mA Product Power: 2W Product Suction Force: ≥500N Release Mode: Manual power off or control center power off release Working Mode: Power on normally open, power off closed Suitable for Door Type: Fire doors, framed, frameless glass doors Package List:1 x Electromagnetic Door Holder 1 x Suction Board4 x Expansion Tube4 x Screw Package List 1 x Electromagnetic Door Holder 1 x Suction Board 4 x Expansion Tube 4 x Screw