Delta is a universal power bank, compatible with most commercially available smart phones and tablets (of any operating system). Built-in lithium polymer battery with safe and stable charging capacity of 6,000mAh 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 the motion sensor, just shaking to show it’s the remaining capacity. With an extra USB outlet, can charge 2 devices (e.g., iPhone) simultaneously. The fashionable colors meet a variety of color preference.