Smatree Extended Battery (1260mAh) and Waterproof Backdoor for Gopro Hero 4, 3+ Extended battery pack; Seamlessly attaches to the back of your camera to extend battery life Rated at 3.8V and 1260mAh for extended battery life; Premium Japanese cells for longer battery life with no memory effect Displays battery level or charging status on camera and battery Fully compatible with HERO4, HERO3+ cameras; Can be charged using any standard USB charger Package:1 x extended battery, 1 x waterproof backdoor, 1 x USB cord. Camera is not included.