... can avoid 180 degree swing & falter, which is suitable to use in any kind of environment.5. Logic control cassette recorder ... with Dual channels UHF or VHF fix frequency wireless system optional (UHF have 50 to 70 wireless transmission distance,VHF have 20 to 30 wireless ... memory card,MP3,MP411.Built-in advanced receiver modular system with two wireless mics (handheld ,lavalier ,and clip type optional ) ...