Adds another wall switch to a room or hall without additional wiring, replaces one existing switch, adds a wireless one that can be located anywhere within 100 ft Controls up to 500 watts incandescent lighting, up to 100 ft range. Wireless add-on switch includes: 1 transmitter wall switch unit, 1 receiver wall switch unit, 2 wire connectors and 2 number 8 x 2 in wood screws. Uses a 9-volt alkaline battery, not included. In typical use the battery will last one year. 120 volts AC, 60 Hz.