Purchased it to charge a number on non-apple devices. This Pisen portable power station works as said and is extremely handy for charging my smartphone. The round button is the power switch which controls the charging status. LED light indicates the power level. The large capacity of Li-ion battery is 2200mAh, as it can recycle charge over 1000 times. A MTO-2 USB cable would be given freely with this battery. It weighs 70g, super light. For this colorful portable power charger battery for smartphones digitals, I would say 5 stars.