Perfect for travel. I love that this can charge my Android phone fast. This Pisen power station does a okay job. Intelligent chip identifying built-in units help this power station recognize the current of the inserting smart devices automatically. The round button is the power switch which controls the charging status. The large capacity of Li-ion battery is 4400mAh, as it can recycle charge over 1000 times. A MTO-2 USB cable would be given freely with this battery. This portable Apple iPhone Android smartphone power charger battery gives me a lot of options on equipment setup.