GoPro Dual Battery Charger + Battery for HERO4 Black/HERO4 Silver (GoPro Official Accessory) Simultaneous Charging: The only GoPro battery charger that lets you charge two GoPro Batteries at the same time. Standard USB Compatibility: Can be powered with most standard USB chargers, the GoPro Wall or Auto Charger (sold seperately) or a computer. LED Indicator Ligts: Dual LED Lights indentify the charging status of both batteries: in process (amber) and fully charged (green). Use Your Camera While Charging: Dont stop shooting just to charge up. Use the Dual Battery Charger to charge your spare batteries while you use your camera. Includes a Spare HERO4 Battery: Comes with an extra 1160mAh Lithium-ion rechargeable battery for your HERO4 Camera. For use with HERO4 Cameras only