Wireless plug in mains powered door chime solution. Simply plug receiver in and mount the bell push in desired location - 58 ringtones - Volume control up to 110dB - Eye catching visual alert when doorbell can't be heard - Hassle free installation, no running any wires - Learning code prevents interference from other wireless transmitters - Additional plug in receivers or bell pushes can be added if desired - Working Frequency: 433Mhz - Working Temperature: -20 - 50° C Bell Push - IP55 rated - Black - Door number sleeve - Can be screw mounted or with double sided sticker pads - Battery powered requires 1 x 12V 23A battery (included) - Power consumption: less than 10mW - Range of approx. 150-200m* Receiver - Indoor use only - 230V Plug in receiver - Power Consumption: less than 0.3W - Range of approx. 150-200m* *Dependent on environmentTechnical Specification:Depth (mm): 26.2Dimensions: Height: 81mmWeight: 0.15KgWarranty: 1 Year