SDDS-SSS001-1 is for a residential size Hidden doors with one handle. The handle is on the inside of the room to be able to get out, just simply pull-down the handle for exit. The opposite side is completely hidden and uses an RFID card to operate the lock and gain access to the room. This uses 3 AAA batteries and has a alarm on it when the batteries start to go dead. If not replaced before it reaches low voltage, the lock will unlock so that you are not locked out of the room. Simply change the batteries. Programming doesn't change when batteries die.
These are used in secret rooms, bookcases, and other areas that requires a residential type locking mechanism. These are not rated for outdoor use. INDOOR USE ONLY.