Installing your wireless chime system is easy: the button is battery-powered and all you have to do is plug in the chime. No wiring is required. Communication between the bell button and the chime takes place via radio frequencies (433 MHz, open field range: 150 m). You can connect the chime anywhere in the house and even move it 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 shows your visitor that the doorbell has been activated. The waterproof wireless doorbell button uses one 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., Weight: 0.3527396192 pounds, Manufacturer: Byron