Characteristics: 1. Professional charge chip controls, ensure the efficiency and exactitude. 2. Automatically detects and charges 2-3 cells lithium battery pack. 3. True over charge protection for each cell, avoid the over charge damage to battery. 4. The LED will change colour when battery pack is fully charged. And there is still a trickle charge until battery pack is completely charged. 4. Two LED indicates three different situations, ensure user clearly control the charge process. 5. Input port has reverse connection protection and short-circuits protection. Output port also has reverse connection protection. Any abnormal use will lead to warning by LED. 6. Can use in high temperature environment of 50℃. Adapt to outdoor use. 7. Metal casing of better heat dissipation function, more fashionable, durable and portable. 8. Wide input voltage range: DC 12-16V input.