... requirements for audio coder, putting the playing function for USB and SD card and 2.0 Power Amplifier function onto multimedia Products ... , and much more convenient to use,used for Gift speaker,USB speaker,MP3/mp4 speaker,computer speaker,PC speaker mobile phone ... /PAUSE,NEXT / VOL+.Power: built-in 3.7V battery.Mini USB supply power and chargeOutput power: 2 X 2WMeas:Plastic--220 ...