This is such a useful & practical solution to turning your lighting on & off in one fell swoop, whether it's Christmas or not! Simply plug any appliance, like one of our pre-lit trees for example, into the remote controlled socket & use the Zapper to turn the plug socket on & off. It's that simple! It's ideal for hard to reach sockets or if bending is a problem. The Zapper is operated by radio frequency & works over a million different codes to avoid interference. It has an impressive transmission range of over 20m (open area). Please note the maximum loading for the Zapper socket is 3120W. You will receive 1 remote control & 3 remote receivers. The remote control takes 1 x L1028 1-12V DC alkaline battery which is not supplied.