The Byron DBY-22314UK Wireless Doorbell Kit comes with a both a portable and a plug in chime unit which can be plugged in to any standard UK plug socket, giving you the flexibility to move your door chimes anywhere throughout your home, garden or garage. The portable unit requires 3 x AA batteries (not included), and both units will ring up to 150 metres (open distance) from the bell push. Choice of 16 melodies, adjustable volume & compatible with all other Byron 'DBY' products. Features: Wire free, weatherproof, 16 melodies, volume control, operating distance 150m, fixings included. Batteries required: 3 x AA (not included) and 1 x CR2032 (included).