Sirus Quad H 823, Dynamic UHF handheld transmitter, Compatible with Sirus Quad R 823 (art. #502806# - not included), Polar pattern: Cardioid, Synchronisation with the receiver via infra-red, Frequency band: 823 - 865 MHz, Frequency range: 40 - 18.000 Hz, Distortion factor: <0.5% @ 1kHz, Transmitting power: < 30 mW (switchable), Battery: 2x AA 1.5 V, Battery life: 8 or 15 hours (depending on transmission power), Display: frequency and battery status, Dimensions (Ø x L): 51 x 245 mm, Weight: 350 g, Colour: Matt Black