Hampton Bay HB-7902-02 is a wireless doorbell system that allows you to add a wireless doorbell chime to your existing wired doorbell. The wireless chime can be placed anywhere in your home, up to 150 feet away from the doorbell button. The system includes a plug-in transmitter that connects to your existing doorbell wiring and a battery-operated receiver that plugs into any standard outlet. The doorbell system features a variety of chime melodies and volume levels, so you can customize it to your liking. The HB-7902-02 is also weather-resistant, so it can be used both indoors and outdoors.