The Byron DBY-22313UK 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 through chime unit which means once plugged in you do not lose the use of the socket giving you the flexibility to plug your door chime in anywhere throughout your home. The chime unit will ring up to 150 metres (open distance) from the bell push.