Ex-Pro® USB TC1 Dual (Twin) Fast Charger - Simple design USB Powered charging - Value pack includes Multi Country Dual USB Mains adapter for charger (Can also charge GoPro Directly with your GoPro USB Cable). Charges 2 x GoPro AHDBT-401 batteries directly for GoPro 4. CE Approved for Electrical use, ROHS Approved product. Charges in an average of 2 hours depending on the mAh of your batteries and the Amperage of your USB charger (Higher rated - faster charge !). Automatic Cut-Off on completion of charge, Charge indication LED lights. Super small and great for travelling. 100% compatible with all OEM and None OEM batteries stated. Ex-Pro battery cell's are manufactured to the highest standard meeting or exceeding the original manufacturers specification and supplied with a 2 year RTB guarantee. Ex-Pro® batteries are fully tested and built with lithium-Ion technology to ensure maximum Power and battery life with zero memory effect and low self discharge. Save pounds on OEM manufactures replacement costs. Suitable for a wide range of Cameras listed. High Capacity Long Life lithium-Ion cells with short-circuit, overvoltage and overheating protection. 2 Year Ex-Pro® Warranty - CE APPROVED PRODUCT. Ex-Pro® Package includes :- 1 x LED Indication DUAL Mains charger (CE Approved) 1 x USB connection cable for charge operation 2 x Ex-Pro AHDBT-401 Batteries 1 x Ex-Pro Worldwide (UK/EU/USA) Dual Port USB Mains Adapter/Charger 2 Year Ex-Pro® Manufacture Warranty. Compatible with batteries :-GoPro AHDBT-401 Compatible with the following devices :-GoPro Hero 4