Sirus Quad C 823, UHF Conference Desk Station with Gooseneck Microphone, Compatible with Sirus Quad R 823 (Art. 502806 - not included), Condenser microphone, Characteristic: Cardioid, Synchronisation with the receiver via infra-red, Frequency band: 823 - 865 MHz, Frequency range: 40 - 18000 Hz, Distortion factor: <0.5% @ 1 kHz, Transmitting power: < 30 mW (switchable), Battery: 2x AA 1.5 V, Battery life: 8 or 15 hours (depending on transmitting power), Display: Frequency and battery status, Volume control, Length of gooseneck: 410 mm, Dimensions of microphone unit (W x H x D): 175 x 115 x 50 mm, Weight: 650 g, Colour: Black