Delta is a universal power bank, compatible with most commercially available smartphones and tablets (of any operating system). Built-in lithium polymer battery with safe and stable charging capacity of 6,000 mAh and conversion rate greater than 85%. A smart 2.1A output (max.) and a slim yet tough shell. Unique input and output cable 2-in-1 design can charge and been charged at a time and easy to store. With motion sensor − just shake it to show it’s the remaining capacity. With an extra USB outlet, can charge two devices (e.g., iPhones) simultaneously. The fashionable colors meet a variety of color preference.