... guided tour system, whisper tour guide. Apply to teaching, tour guides, conference, Interpretation, training 200m distance ... Apply to teaching, tour guides, conference, Interpretation, training 200m distanceSpecification : Frequency Range: 794-806MHZ. Digital audio with 64K ... 5msFeatures and Advantage: 1.wireless tour guide system, audio guide system,teacher wireless microphone2. UHF digital wireless ...