Uni-Com Curve Plug-Through Door Chime Designed with a built-in socket for plugging in other devices, the Curve door chime from Uni-Com helps you make the most of your space. It comes with the option of eight melodies and a large 120m operating range so you can place it anywhere around the house. Operating distance: 120m 8 melodies Sound output: 88dB Connects up to 4 bell pushes Includes: Door chime and bell push Batteries included