The Byron DBY-22312UK 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-22312UK Wireless Doorbell comes with a plug in chime unit which can be plugged in to any standard UK plug 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.