2 LITHIUM-ION BATTERIES - Includes 2 rechargeable 3.7V 1050mAh lithium-ion batteries?? dual dock charger and USB charging cable.</br>DUAL DOCK CHARGER - The dual dock charger allows you to charge 2 GoPro batteries simultaneously so you can always keep the camera rolling.</br>OVERCHARGE PROTECTION TECHNOLOGY - LED indicator lights inform you when the batteries are fully charged and ready for use. Th