2.4G USB wireless microphone 1.it convenient for you to medium ... .30W 2.4G USB wireless microphoneThis product is digital portable amplifier with USB port and SD card reader,use ... a clear voice, strong volume, the use of simple and low cost, schools, outdoor lectures, dance,tour guides, ... 0.25KgsStandard Configuration:1 pc main machine(Amplifier) 1 pc Headset Microphone(5 different style for choose) 1 pc ...