Sirus Quad C 470, Professional UHF Conference table Microphone Unit With Gooseneck Microphone, Compatible with Sirus Quad R 470 # 543456, Condenser microphone, Characteristic: Cardioid, Synchronisation with the receiver via infra-red, Frequency band: 470-526 MHz, Frequency range: 40 Hz - 18 kHz, Distortion factor: <0.5% @ 1kHz, Transmitter power: < 30 mW (switchable), Battery: 2x AA 1.5 V, Battery life: 8 resp. 15 hours depending on transmission power, Display: frequency and battery status, Volume control, Dimensions gooseneck length: 410 mm, Microphone unit (WxHxD): 175 x 110 x 50 mm, Weight: 650 g, Colour: Black