UHPPOTE 2000Kg/4409lb Holding Force Fail Secure Electric Bolt Lock W/Signal Time & Open Wire Fail secure - Locked when power is removed Solid Bolt: Polishing housing, 2000Kg/4409lb Holding Force Autolock Time Delay: 0/3/6/9 sec Signal Output: Lock signal(NO/NC/COM); Door signal: NO/COM Suitable For: Wooden Door, Glass Door, Metal Door, Fireproof Door