... .Built-in rechargeable li-on battery 3.Support TF card and USB flash disk 4.USB 2.0 Mini ... audio speakersDetail products descriptionMain Features1 computer speaker,also for mobile phone, mp3,mp4,audio player2 Easy charging-can ... stereo.2, USB power supply.3, It is convenient for your travel ,portable, super slim and mini size, easy ... USB 2.0 mini audio speakers with cheap price for promotion!