Heathco Canada SL-6166 Door Chime, Transmitting Range: Upto 100 FT, Tone: 8 Note Westminster Or 2 Note Melody For Front Entrance And 1 Note For Rear Entrance, 75 DB Maximum Loudness, Mounting: Plug-In, White, Wireless, Unlighted, 3-1/2 IN Width X 1-3/8 IN Depth X 5-1/8 IN Height