... ,with CE,ROHS,ISO etc 2,professional amplifier,with USB,TF,MPS input 3, ... and has a highly steady operating distance. The amplifier speaker features extended frequency response range. Clear ... sound reproduction for live applications. This amplifier speaker is suitable for on-stage performance, teacher ... FM radio with antenna3,with echo4,with LCD digital screen,size:30x22 mm5,with the function: ...