... Popular design rechargeable trolley speaker Wireless pa system with USB/FM radio/wheels/handle,trolly speaker Model:NDP-210Distortion: 0.1% Specification ... and SD memory card function, Support MP3 music format2. With FM Radio, Guitar input3. With Karaoke function,2 microphone socket input4. Volume ... /TV and other audio input Wireless pa system with USB/FM radio/wheels/handle,trolly speaker