Wireless Door Chime - Up to 80m Overview - This device can be plugged into any UK socket and the doorbell used to activate the receiver, the receiver will play up to 16 selectable melodies (button on the side). The receiver also provides a pass through 13A socket so it won't take up any valuable plug sockets within your home. Technical Specification - Digital coded signal to prevent interference Range - 80m (open air). May vary when going through walls Dimensions of receiver - 116 x 47 x 68mmDimensions of transmitter - 88 x 20 x 36.5mmBattery in transmitter - 12V (23A)Frequency - 433.92MHz (±150kHz)13A 230Vac 50Hz Socket Indoor use only Peace of mind - This product has been tested to CE and ROHS standards.