General Information Type of transmission: wireless Range in the open area: 100m Colour: white Possibility of extension by an additional transmitters: yes Receiver Power supply of the receiver: 230V~, 50Hz Type of power supply of the receiver: mains power supply Number of ringtones: 1 Doorbell volume (db): 80 Volume adjustment: no Optical indication: no Dimensions of the receiver (width x height x depth [mm]): 75 / 120 / 65 Transmitter Power supply of the transmitter: 1 x CR2032 Type of power supply of the transmitter: via battery Battery included (transmitter): yes Protection rating: IP44 Dimensions of the transmitter (width x height x depth [mm]): 45 / 103 / 20