Mirco and Mini USB Dual Charger Battery Pack for GoPro HERO4 AHDBT-401 Camera Camcroder With high-tech Japanese cells, batteries are rated at 1280mAh for longer battery life equal or exceed battery; Rapid 2-channel chager allows you charge 2 batteris once to save time; Batteries and chargers are compatible with the HERO4 Black and HERO4 Silver models; 2 USB port includes. Can be powered by any USB ports (car cigeratte,computer,pc, lapter ect); CE Safety Certification,3-year Warranty.