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 have a hard time keeping your phone charged when you’re out in about, then this is by far the best option for you.