US Patent 7382250 Lock system with remote control security device

A lock includes two independently operating locking mechanism, one locking mechanism operating electronically and one locking mechanism operating mechanically. The lock may include a device for receiving and decoding an electronic unlock signal and a memory source for storing multiple unique unlock signals. The electronic signal may be generated from a remote source or on the lock itself. The lock also may include a button that allows unique unlock signals to be added or deleted from the lock memory.