Features Automatic Closing : Designed for emergency escape, automatically closes the door in case of fire, ensuring safety. Special electrician magnet with no residual magnetism in case of power failure. Manual Release: Equipped with a manual closing release button, ensuring the door can be closed in case of fire smoke, providing added safety measures. Sturdy Aluminum Alloy: Made of aluminum alloy with a layered inner cavity structure, offering a maximum suction force of up to 80Kg, ensuring reliability. Pure Copper Enameled Wires: Interior uses pure copper enameled wire winding, resistant to high voltage, improving working efficiency and durability. Scientific Design: Adopts excellent components, simple wiring, only needing to access the positive and negative electrodes to energize, ensuring ease of installation. Specification: Item Type: Fire Electromagnetic Door Holder Material: Aluminum Alloy Rated Working Voltage: DC24V Current: 80mA Power Consumption: ≤ 2W Suction Force: ≥500N Remaining Magnetism: ≤3N Package List: 1 x Fire Electromagnetic Door Holder 1 x Suction Plate 8 x Screw 8 x Expansion Screw Package List 1 x Fire Electromagnetic Door Holder 1 x Suction Plate 8 x Screw 8 x Expansion Screw