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Characteristics used for sound signal, ideal for doorbell or calling device receiver powered by the main 230V battery transmitter power supply hermetic call button 48 built-in polyphonic bell sounds can be increased if necessary, the number of simultaneous calls and buttons can be increased training system (automatic registration) no calling device is needed useful at home, company, public buildings or care for individuals Technical parameters: range: max 100 meters (in an open place) power source: receiver: from a 230V AC mains socket, transmitter: 1x12V A23 (included) volume: 50-80 dB (adjustment) protection level: receiver: IP20, transmitter: IP44 frequency: 433.92 MHz dimensions: 120 x 87 x 35 mm (./wys ./g etc.)