... ,seminas ,business conferences ,worship centers ,exhibitions ,aerobics training ,shopping center presentations ,sporting functons ,wedding ceremonies ,paties and any occasion ... with Dual channels UHF or VHF fix frequency wireless system optional (UHF have 50 to 70 wireless transmission ... memory card,MP3,MP47.Built-in advanced receiver modular system with two wireless mics (handheld ,lavalier ,and clip ...