Install this single-door proximity access control system in your home or small office, and grant access to up to 25 users, simply and quickly. This compact standalone system consists of a wall-mounted reader/controller unit and encoded proximity tags, and works with the electric door strike or deadbolt on your door. It is easy to install and program, and requires no separate controller unit and no PC or programmer. Power Supply and Doorstrike sold separately. To program the system, simply hold the master tag up to the reader/controller and then use the master tag with the reader/controller to program up to 25 total tags. The system assigns a unique code for each tag, out of a trillion combinations. The proximity tags are powered from the RF signal transmitted from the proximity reader. They are totally sealed, measure 2 1/8" x 1 3/8" x 9/32", and are ideal for clipping onto a key chain. This system features programmable unlock duration and includes 6 proximity tags (additional tags sold separately). The weatherproof reader/controller unit measures 4-1/2" H x 2-3/4" W x 5/8" D and is designed for internal or external use.