Fixed frequencies UHF wireless microphone Using 700-850MHz band to avert frequency interference Small and useful,easy to carry PF-680 professional UHF wireless microphone  Main featureFixed frequencies UHF wireless microphones Using UHF 700-850MHz band to avert frequency interference.SMT tech for PCB, more stable function.ALL using quartz crystal oscillating circuits.High efficiency batteries consumption design.The space availability is more than 60 meters at the clearing.It is suitable for stages, ballrooms, classrooms and home use.Small and useful, easy to carry, the receiver can hang on the wall SpecificationsFrequency range--- UHF700-850MHzFrequency Stabilization --- <±10ppmDynamic Range ---- 100dBTotal Harmonic Distortion --- <0.5%Frequency Response --- 40Hz-18kHz±3dBAudio Output Level --- Unbalance 400mVTHD --- <0.5%S/N ratio --- 100dB 

PF-680 UHF wireless microphone