This GoPro Original AHBBP-301 USB Dual Battery Charger for Hero 3 Hero 3+ Camera is a GoPro original accessory. It is a USB charger that holds two batteries, and will charge them simultaneously. It is designed to draw USB bus power from most USB power sources, including USB wall adapters, computers, the GoPro Auto Charger, and the GoPro wall charger. Dual LED lights indicate the charge status of each battery.