Lithium battery:Voltage: 3.7V
Charger:This charger can charg four batteries at the same time.
It provides overcharge and short circuit for protection.
Input Voltage: D C 5V
Output Voltage: 4.2V
Output Current: 350mAh - 410 mAh
Style1:4 x battery + 1 x charger
Style2:8 x battery + 2 x charger