... . Built-in rechargeable battery 3. USB connector Portable Gift Speaker Box for MP3 MP4 PC Computer Mini Audio ... Amplifier Features:1. Music Speaker suitable for mobile phone MP3,MP4,MD,CD, ... up to 6 hours of continuous use.3. Portable, USB chargeable. It comes with 2 cables . ... x Charge cable1 x Audio cable1 x BoxPictures: Portable Gift Speaker Box for MP3 MP4 PC Computer Mini Audio ...