Idolpro UHF-620 intelligent wireless microphone system

Brand new come with 1 year manufacturer's warranty. Please make the best offer. Thx UHF-620 is equipped with auto mute function (MIC will pause after left hand for 3 seconds in any direction, any angle.). It will enter into standby situation after 5 mins, auto power off after 15 mins. Features: This new model is with new circuit, with good sound quality, perfect working distance. It is new digital technology, can solve the problem of stringing frequency. With feedback function, operation is more easier. With automatic channel searching disturb function , more convenient installation. Initial volume and MAX volume setting. Boot times functions. MIC will auto mute when drop down. UHF frequency(PLLL). 100 x 2 channels, space is 250 KHz. Use the 5th battery, can keep 6-10 hours Working distance at least 80 meters. External Squelch knob is on the rear panel of receiver, can flexible to set between 10 m -80 m. Mainly for karaoke project, one receiver with two transmitters. Can be use 100 units at the same time of one KTV. Specification: Frequency range：640-690MHz Channels：100×2 Modulation Mode：FM（PLL） Frequency Stability：±10ppm Sensitivity ：-95~-67dBm Frequency：40-18000Hz Harmonic distortion：≤0.5% Noise ratio ：≥110dB Output：balanced or mixing Transmitting power：3-30mW Battery type： Power：100-240V 50-60Hz 12VDC or 220VAC/50-60HZ 12VDC Power consumption：≤10W Amplified power systems and hard drive karaoke players speakers mixer karaoke amplified wireless microphone systems