The Byron DBY-23522UK is the perfect easy to install doorbell for any home no need for wiring. Just follow the simple step by step instructions and your new doorbell will be working in no time. This Byron DBY Wireless Doorbell comes with a plug in chime unit which can be plugged into any standard UK plug socket giving you the flexibility to plug your door chime in anywhere throughout your home. The portable unit requires 3xAA batteries (not included) and will ring up to 200 metres (open distance) from the bell push.