UHF wireless acoustic transmission receiver.With 6 selectable channels, and effective range is up to 100 meters.Complex interference-free circuit for using more than 4 sets simultaneously without mutual interference.PLL frequency synthesis technique for stable signal transmission.Dynamic expanding circuit for high S/N ratio.Low power consumption design for long time usage.Receiver use LCD-display to indicate frequency, channel, battery, level status.Suitable for wireless tour guiding, simultaneous translation, audio-visual education, etc.Frequency Control: Phase Locked Loop(PLL)Frequency Range: 780-789MHzEffective Range: 100 MetersNumber of Channels:6Operating Current: 70mA10mA(Receiver)Receiver Frequency Response: 30Hz-15kHzS/N Ratio: Greater than 50dBReceiving Sensitivity:S/N 12dB 3uVPower Supply: 2x1.5V AA Batteries (not included)Colour:BlackMaterial:Plastic + MetalPackage Contents:1 x WTG-500R receiver1 x earphoneOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.