This small cool Romoss power bank with digital display packs a huge punch, with 20,000 MAH, you can charge your iphone up to 8 times and your tablets up to 3 times on one charge. This smart powerbank not only efficiently charges your devices, but has a built in chip that detects what type of device you have to prevent over charging. This power bank comes with a smart digital display that gives real-time and accurate charge status. After 5 seconds the display status will turn off and after 1 minute the power bank will go into sleep mode, so there is no power lost. This power bank comes with two charging ports, a regular power output and a 2.o power output that doubles your charging speed. The outside alloy shell is very robust and sturdy; ready to take on any environment. If you have a hard time keeping your phone charged when out and about, or if you just want to take some extra charging power with you, then this is by far the best option for you.