... sound reproduction ,well suited for any PA application,in cluding home Karaoke ,education ,seminas ,business conferences ,worship centers ,exhibitions ... channels UHF or VHF fix frequency wireless system optional (UHF have 50 to 70 wireless transmission distance,VHF have 20 ... memory card,MP3,MP47.Built-in advanced receiver modular system with two wireless mics (handheld ,lavalier ,and clip type optional ...