Worldking WK1204 trolley speaker comes with two wireless microphones that can cover up to 100 meters. It plays music with USB, Bluetooth or memory card.It has Bass, Treble and Echo sound controls, with MiC port, battery charging and low power indicator. You can connect it to play keyboard or guitar. It has double switch one for ON and OFF and one. It has Bluetooth and Radio which will be selected from MODE BUTTON at the back of the speaker,get more details about this speaker in the manual.