100% brand new and high quality Excellent battery heat management， constant current and constant voltage protection Red light will be on when charging， green light on after full charging Suitable for Action Camera SJ4000 Item Type: Battery Charger Charger Material: Plastic Suitable Battery Type: 3.7V Li-Ion Battery 900mAh 3.33W Suitable Devices: For SJ4000 Interface Type: USB Input: AC 100-250V 50/60Hz Output Voltage: DC 5V Package Included: 1* Charger Adapter(Charging Cable Not Included)