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The use of magnetic energy to lock the door. 180kg (350lbs) retention force. Embedded in the reverse current protection device (OVD). Alluminum shell adopts the high resistance material. With processing hard anodized. Corrosion resistant. Goof quality and durable to use. Can be opened by pressure switch. remote control, etc. Suitable for wooden door, metal door, glass door, fireproof door, etc.