PROMATE 10000mAh Ultra-Slim Lithium Polymer power bank with dual USB Ports. Compatible with all smart phones & tablets Automatic voltage regulation. Colour black.Charge your devices on-the-go with this powerful 10000mAh lithium polymer power bank with dual USB ports: VolTag-10. It features two ultra-fast USB charging ports to charge any USB-chargeable device. VolTag-10 also includes Automatic Voltage Regulation i.e. it provides an optimum output based on the device connected. VolTag-10 is compatible with all smartphones &tablets.