A quick solution: a wireless doorbell without the need for wires! A large operating distance of about 80 meters depends on the type of walls and distances in the house Works automatically without the need for programming (quick programming mode is available) Ring volume is adjustable You can use several internal bells connected to one button (three bells + call button) Internal memory for the bell, even if the unit is disconnected from the electricity. Call button does not need a battery! Simple installation about 5 minutes. Blue lighting and a large variety of ringtones