Additional alarm clock, surface-mounted, for signalling incoming calls, pearl white (similar to RAL 1013), - for signalling incoming calls, - built-in TAE socket, can be closed with a blank cover, - signalling via piezo sound transducer and optically via light-emitting diode (LED), - volume and tone frequency adjustable, - volume 92 dB(A), measured in a small reverberation room, - tone frequencies 800-1333 Hz, - operating voltage: 30 V-60 V, 23 Hz-55 Hz, - housing parts made of ABS, - protection class IP20 in accordance with EN60529