doorbell: 1.Button: 23 12V/DC; Receiver:3V DC; 2.150M range &315MHz 3.32 pcs music 4.Chime Sound: 80~90DB, CE certificate Wireless doorbell:Features:1) · Suitable for homes, office installed in or outdoors buildings and ships etc.2) · 32 sounds selectable at either transmitter or receiver.3) · Transmitter uses 1x12V 23A battery (supplied).4) · 150m operating range.5) · Easy to install.6) · No ...