Feature
1.Chip:  TP4056
2.Current: 1A (adjustable)
3.Charge precision: 1.5%
4.Input voltage:  4.5V-5.5V
5.Full charge voltage 4.2V
6.Led indicator:   red is charging
7.Input interface:  micro USB
8.Work temperature:  -10 Celsius  ~ +85 Celsius
9.Inversed polarity:  NO
10. Board size :  22.06 mm  * 17.13 mm