We are specialized in r&d and manufacturing audio product----uhf wireless tour guide / simultaneous interpretation system, our product's special features as follows: 1.Super mini, light weight, metal shell and five colors for choice 2.Uhf professional frequency, pll synthesized design, 32 channels available 3.16 digital id pilotone design to avoid the background noise 4.High performance double-if circuit design to enforce rf level 5. 96*64 dot matrix white lcd display 6.Lcd display channel, frequency, volume, battery, rf level, af level, transmitter gain, rf power, and lock. Mode 7.Transmitter dynamic display of af level, af over load warning, 31-step microphone gain adjustment design 8.Quick-mute function 9.Receiver digital 16-step volume control 10.Receiver digital 21-step sq adjusting 11.Locking protection of panel operation with security codes 12.Inputting lithium-ion battery working for 9-11 hours 13.Two ways of attaching belt clips: downwards and upwards 14.3.5mm input jack for inputting background music, cd, mp3, etc 15.Transmitting range 300 ft (line-of-sight) Carton