This Byron DBY-22324UK Wireless Doorbell Set in stylish mesh finish comes with a wireless battery-powered door chime and a plug-in door chime unit, along with a bell push. This offers flexibility to place your door chimes anywhere in your home, garden, or garage. The door chimes have a wireless range of up to 150m (in open distance) and feature a visual alert system. The set includes 16 melodies, volume control, an IP44 rated bell push, and is easy to install. The twin pack contains a portable and a plug-in chime. The portable doorbell requires 3 x AA batteries (not included).