Neewer 7500mAh External Battery Pack Portable Power for External USB Devices Dual Battery Charger for Gopro Hero 4 AHDBT-401 Compatible with various mobile phones, tablets, GPS and other USB devices.^With LED flashing indicate the status of charging^Dual charger for Gopro Hero 4 batteries.^Charging for external USB devices, like iPhone iPad Samsung Galaxy Android Phone and other Smartphone Tablets.^Simultaneous charging. Can charge the batteries and USB devices at the same time.