This machine suitable for the following charge capacity 3000mAh lithium-ion (Li-ion) standard voltage 3.6/3.7V the phone battery Built imported IC chip can automatically identify battery polarity, fast, full automatically when closed. Built-in high-performance switching power supply wide voltage range, AC voltage 18O-24OV. Standard 4.2V Charge voltage limiter absolutely sufficient, however, has a protective effect on the battery. Stable performance, simple operation, safe, reliable easy to carry, is the ideal companion for mobile phones