General Information Type of transmission: wireless Range in the open area: 70m Colour: white Possibility of extension by an additional transmitters: yes Receiver Power supply of the receiver: 3 x AA Type of power supply of the receiver: via battery Battery included: no Number of ringtones: 1 Doorbell volume (db): 60-80 Volume adjustment: yes Optical indication: no Dimensions of the receiver (width x height x depth [mm]): 68 / 120 / 32 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