Product Feature: 1.International advanced Bluetooth chip and circuit design techniques,support all bluetooth device. 2.With FM function,can search radio station broadcast automatically. 3.With HI-FI speaker,to sure the clear and bright sound quality. 4.Support TF card 5.Dual power supply by mini USB charging/BL-5C Lion battery,Smart and fast charging. 6.Play music after pairing with Bluetooth device for example mobile/Mid/TV,the working distance is with in 15m. 7.Built-in microphone for hands-free phone call. Key function: 1.Power switch:off to close,on is working. 2.DC-5V charging slot. 3.Micro sd slot:it can decode and play mp3 format audio when put micro sd card into the slot. 4.Line in:it can play audio via aux cable to audio device. 5.When play music,press short to switch TF/FM/BLUETOOTH/Lint in 6.Press short for last song,press long to turn down the volume. 7.Press short for next song,press long to turn up the volume. 8.When play music(TF card/Line in/bluetooth),press short for "play/pause".(in FM mode,press short to search station automatically,press again to stop searching) 9.Under bluetooth mode,press short to answer a call hand-free,when phone calling,press ahain to hand up,press ling to disconnect bluetooth. Product specifications: Bluetooth: V2.1 Working Distance: 10M Voltage: DC 5V Battery Charge Time: 2H Speaker: 43W S/N Ratio: >75db Frequency Response: 120HZ-18KHZ Dimension: D=80MM Net weight: 260g Package: 1 X bluetooth speaker 1 x charging cable 1 x retail box