The Romoss Solo 2 4000mAh Power Bank is a sleek and stylish external battery charging source that offers great portability and optimum functionality to end-users. Powered by a robust 4000 mAH battery, it offers compatibility with a plethora of modern-day gizmos such as notebooks, ultrabooks, smartphones, tablets, iPhones, iPods, iPads, PSPs and all such gadgets that support USB charging. Furthermore, the Romoss Solo 2 4000mAh Power Bank comes with a flashy LED torch that enhances its visual appeal and offers added utility. Lastly, it boasts of a smart charge/discharge synchronization feature that enables simultaneous charging of both the powerbank as well as the attached device for optimum functionality.