BXT&reg; High Quality Surround Sound Enhancer Build-in USB Rechargeable Battery with 3.5mm Audio Plug Designed Portable Mini Speaker for Tablet Eboo iPad iPhone Samsung etc (Black) Build-in battery,no need for extra power supply.1-1.5 hrs charging time(Don't overcharge. !!!NO INDICATOR LIGHT WHILE CHARGING!!! ) 3-4 hrs working time Superb sound effect,double speaker offers high quality surround sound With this super mini cute speaker ,you will say good bye to low vioce while listen to mucical ,watch moive and playing games Made with gel,super soft and convenient.Just add it on your device easily 3.5 mm audio adapter,perfect for iPad 1 2 3 4 mini,Samsung Galaxy Note/Tab ,Google Nexus,Kindle and all kind of smart phone