The Uni-Com Plug-In Door Chime can be inserted into any 13A socket. The extensive wireless range of up to 120m means the chime unit can be placed in any room around the home or in a detached office at the back of your garden. The weather-resistant bell push is easy to install and quickly pairs with your chime unit. The chime unit can be programmed to one of 8 chimes, including: Westminster chime, traditional Ding Dong or a barking dog for increased security. All Uni-Com door chimes work together and can be mixed and matched throughout your home. Bell Push powered by 1 x CR2032 button cell battery (supplied).