A premium digital camera battery charger can extend both the service life of the battery and camera. That is why we strongly recommend this USB Dual Camera Battery Charger for GoPro HD HERO3. Features dual charging design it can charge for two batteries simultaneously， very time-saving. Adopted high-tech components and precise workmanship， it has a stable performance and won&acute;t do harm to your battery. With high charging efficiency it will save you a lot of time. Additionally， the compact size provides great portability. Considering all these user-friendly design， you should not miss it!                                    Features            Dual charging design capable for charging two batteries at the same timePerfect workmanship to ensure safety and stable performanceFast charging speed ensured by high qualityLightweight， compact and portableEasy to connect due to its user-friendly designCompact size for easy operation and carrying                                                             Specifications            Input    5V 2A    <br>Output    4.2V 800mAh    <br>Dimensions    (1.77 x 1.37 x 0.98) " / (4.5 x 3.5 x 2.5) cm (L x W x H)    <br>Weight    1.62 oz / 46 g    <br>Compatible with    GoPro HD HERO3     <br>                                                            Package Includes            1 x USB Dual Charger<br>