Come and see our amazing products. Built-in Premium A-grade rechargeable lithium ion battery cell 2500mAh can charge your phones and other devices through it's USB port. By connecting the cable, you can not only power the portable device directly, but also charge the built-in battery.Bluetooth connection 3.0, compatible with latest operating systems: Windows 7 & later, Windows Phone 7 & later, iOS8 & later, Android 4.0 & later, Mac OS X & later, easily pair with your phone, pad, Smart phones, laptop or tablets. Pls confirm with us about the packing info, stock color and exact production time before placing your order.