1. charge module linear charging.
2. current 1a adjustable.
3. charge precision 1.5 percent .
4. input voltage 4.5v 5.5v.
5. full charge voltage 4.2v.
6. led indicator red is charging green is full charged.
7. input interface micro usb.
8. work temperature 10? to plus 85?.9. inversed polarity no.10.size small to 25x19x10mm.