Solid and durable TM card key sealed with all-steel; Thorough function of breakage-preventing, intrude-preventing, decode-preventing; Convenient backup power function of emergency; Emergency open door function of fire; Founded with integrated metal to realize super solid; Advance mechanical lock core structure to ensure safety; Automatic lock: Automatic lock 5 seconds after unlock without additional operation; Emergency unlock: User can use emergency unlock method to open door when fire cause the electronic mechanize stop working; Intrude-preventing sensor: Magnetic sensor with working distance of 1-2cm