Portable System 1.Built-in DVD player,USB,SD jack 2.High fidelity cassette player 3.Built-in wireless mic 4.Wireless mic Portable ... Dual channels UHF or VHF fix frequency wireless system optional (UHF have 50 to 70 wireless transmission distance,VHF have 20 to 30 ... memory card,MP3,MP411.Built-in advanced receiver modular system with two wireless mics (handheld ,lavalier ,and clip type optional )2-3 ...