Is designed for lockers with handles and a vertical locking bar. Touching the User Button Key to the lock will unlock the 1/2" deadbolt for 10 seconds providing the user ample time before automatically relocking the vertical locking bar. Unlock time can be set to a different value if specified when the order is placed. An optional Time-Set Button Key is also available. Digilock T-30 operates on 4-AAA batteries (included). Locking bolt moves horizontally and the lock functions similar to Master Lock Models 1630/1631.