Connected doorbell and video door phone -wireless battery door chime eu plug 2 transmitters + 1 receiver Highlights generic brand wireless battery door chime eu plug 2 transmitters + 1 receiver Description: The remote wireless distance distance is up to '350 meters in open space, suitable for domestic and industrial use. The receiver (indoor unit) is a standard EU plug; the push button transmitter (outdoor unit) is powered by 1pcs 12V 32A battery. (Battery is not included). 48 melodies and 6-level adjustable voice volume, reminding you of your guests' coming with charming songs. The smallest volume is the mute mode. All-day anti-interference system, avoid interference outside or between neighbors. Simple and easy wireless installation, just plug and go; save trouble and money. Specification: Transmitter Size: Approx. 73x41x19mm / 2.87x1.61x0.75inch Receiver Size: Approx. 92x54x32mm / 3.62x2.13x1.26 inch Outdoor unit working power: 1pcs 12V battery Indoor unit plug: EU Plug Working distance: 350 meters (open space) Material: Plastic Package includes: 1 Set Doorbell