This keyless garage entry system uses a fingerprint scanner that grants access to up to 10 authorized users, providing more convenience and better security--especially for families with children--because there's no need to memorize a passcode and no keys to lose. The system consists of a receiver inside your garage that wires easily to any existing garage door opener (18' of wire included) and a fingerprint scanner mounted on the outside. Authorized users simply swipe a finger over the sensor; the scanner recognizes their fingerprint and transmits a signal to the receiver that opens the garage door. The system's patented security technology transmits a new code every time, thwarting "code grabbers" used by would-be thieves. Users are easily set up in four simple steps from the scanning unit's keypad. A sliding panel protects the sensor from the elements. The receiver plugs into 120V AC. The scanner requires four AAA batteries (not included) that will provide power for at least a year; an LED indicator tells you when batteries need replacement. 8 1/2" H x 9 1/2" W x 2 1/2"D. (1 lb.)