Simply plug any appliance (like one of our pre-lit trees) into the remote controlled socket, & use the Zapper to turn the plug socket on & off. It's that simple! It is ideal for hard to reach sockets, or if bending is a problem. The Zapper is operated by radio frequency & works over 64 different codes to avoid interference. It has an impressive transmission range of over 25m (open area). Please note the maximum loading for the Zapper socket is 1000W. You will receive 1 remote control & 3 remote receivers. The remote control takes 1 x 23AE 12V battery (not included).