... on-stage performance, teacher guide and so on. Function:1,with USB,TF,MP3 input2,FM radio ... LCD digital screen,size:30x22 mm5,with the function: calendar,alarm clock,showing song lyric,etc.6 ... They also prize a harmonic distortion level under 0.5 percent, the level in which any distortion the amplifier ... AdaptorWith ROHS,CE,ISO 9001 certificate Portable Multi-function Remote Control Megaphone GP955R