Built with the leading Fitcharge Technology, it is perfectly compatible with a variety of smartphones, MP3s, MP4s and other mobile devices. With the superb circuit design, its power conversion rate is higher than 85%. It has 10% more output of actual power into mobile devices than an ordinary power bank with the same capacity. Ease your charging emergency! It can be charged and charge your device at the same time. Never worry about a situation where your power and device are out of power.