Features Specifications:SN-U91 uhf wireless microphone  Frequency range: 740-790MHz Modulation mode:FM Band: 50MHz Select channel: 200 Frequency Stability: ±0.005% dynamic range100d Maximum modulation frequency: ±45KHz Signal-to-noise ratio: 105dB Frequency response: 80Hz-18KHz±3dB Ambient temperature range: -10-+40 RECEIVER: Receiver mode: twice Heterodyne  Antenna: BNC/50Ω sensitivity: 12dBμ(80dBS/N) Range of sensitivity: 12-32dBμ Clutter Suppression: ≥75dB Maximum output frequency: +10dBV Transmitter: Output power: 13mW Clutter Suppression-60db Power supplier: AA×2 Battery life: ≥8hours