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 six devices, two can be active at same time. Can be Keyed-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.