Installing your wireless chime system is simple: just insert the battery in the button and plug the chime into any socket. The plug-through design allows you to use the socket for other devices, and no wiring is needed. Communication between the bell button and the chimes takes place via radio frequencies (433 MHz, open field range: 150 m). You can connect the chimes anywhere in the house and even move them from one floor to another if you need to. Choose from 16 melodies and adjust the volume to suit your needs (5 levels, up to 80-85 dB). An indicator light on the button tells your visitor that the doorbell has been activated. The waterproof wireless doorbell button runs on a CR2032 button cell battery (included), which needs replacing every 3 years or so. Expand your system by adding up to 6 buttons, on the back door, for example. You can even choose a different melody for each button to let you know which doorbell has been activated., Manufacturer: Byron