Entrance door handle with Close Field Technology that allows lock to be unlocked by having a paired device in close proximity… just push one button! Retrofittable in most RV towable entry doors and is easy to install. Pair up to 6 devices, 2 can be active at same time. Can be Key’d-A-Like with other Bauer locks. Fits into a 2-3/4″ x 3-3/4″ opening. Self-contained power with 4 AA batteries (Comes with 4 Energizer Ultimate Lithium batteries – recommended). Keeps track of locking/unlocking history. Programmable with 4-digit PIN number. Includes two keys and hardware.