FEATURES UHF 500-980MHz band PLL frequency synthesized Max.12 sets was used at the same time, CPU control with LCD display Multi-Channel with high frequency to avoid the interference Audio compressing-expanding technology. The system can reduce the noise and increase the dynamic range back sound restrain function can avoid back sound scream Multi-level noise supervisory circuit Special with the tone locked system make the system has a strong anti-jamming Up to 100 meter operation distance in perfect environment. SPECIFICATION  Frequency Range: 500~980MHz Tone Frequency: 32 K-51.0 KHz Frequency Stability: +/-10ppm Selectable Channels: 4x32 S/N :> 105db T.H.D. at 1kHz: 0.5% Frequency Response: 40Hz-18 KHz Transmitter Power: H10dbm, L5dbm Cartridge Gain: -20db to 30db Modulate Mode: FM FM Max. Frequency: +/-45 KHz High Wave: