Wireless Network Doorbell 36 Sounds 300m Long

technical data:general:transmission type: wirelessrange in open area: 300mcolor: whitepossibility of expansion with additional transmitters: yesreceiver:receiver supply voltage: 230v~ 50hzreceiver power supply type: mainsnumber of ringtones: 36ring volume level (db): 60-80volume adjustment: yesoptical signaling: noreceiver dimensions (width / height / depth [mm]): 54 / 115 / 66transmitter:transmitter supply voltage: 3v (1xcr2032)type transmitter power supply: batterybattery included (transmitter): yesip protection rating: ip44transmitter dimensions (width / height / depth [mm]): 29 / 78 / 17.5frequency: 433.92mhz±20khzother features: learning systemwireless network doorbell is intended for use in houses apartments offices hospitals shops etc. It does not require a doorbell installation. The doorbell (receiver) is plugged directly into a ~230v mains socket while the transmitter is powered by a 3v cr2032 battery. The learning system function allows for logging in additional buttons (max. 4). The 433.92mhz radio frequency is used to transmit and receive the signal. The doorbell range in an open area is 300m. The receiver has a 6-step volume control up to 80 db and 36 polyphonic ring tones.**photos are for illustrative purposes only.