Krismile&reg; 003A2 2 Plug-In 110V Cordless Remote Wireless Digital Doorbell with Battery and 38 Polyphony Sounds (White) Flash light ON when visitors press the remote button. Remote control range can be up to 150meters. Plug in and use-no set up required. One remote doorbell button, two plug-in doorbells with 38 polyphony sounds. The volume can be adjusted. Special design for USA, 110V, with 38 polyphony sounds and battery inside. You can install the doorbells in locations, such as kitchen, back yard, bedroom, etc.