1. Charge Module - Linear charging; Dual Protection 2. Charge precision- 1.5% 3. Input voltage- 4.5V-5.5V 4. Full charge voltage - 4.2V 5. Charging Current - 1A max. 6. Input interface- micro USB 7. Work temperature- -10° to +85° 8. Reverse polarity protection - NO 9. Led Indicator - Red is charging, Green/Blue is fully charged 10. Size - small to 25X19X10mm NOTE: 1. Ampere meter can only be connected to 5V input end of the module 2. It is better that the charging current is 37% of the battery capacity 3. If you charge to the battery of 1000mAH, current of 400mA is enough 4. The connection wire should not be too thick 5. Make sure the connect point is good 6. If the input voltage is too high, like 5.2V, the current will be less than 1000mA, it is normal 7. It is protection function, auto-subtract the charging current to avoid burn damage to chip 8. No Reverse polarity protection.