Product details of Speaker Bluetooth JBH JB5001/5002· Connect DC5V · adaptor plug into socket DC5V at the side of this unit for rechargingPlay MP3 format music from memory car, · FM function FM frequency response: 87.5-108mhZ · Connect 3.5 stereo audio cable to socket of LINE IN you can play musicsources from mobile phone.MP3. MP4.· PC and other audio devices. Backward /V-: Long Press: Vol-, · Short press: backward, under FM mode