Designed specifically for Hero 4 camera batteries， the 5V 2.1A Input 4.35V 800mAh Output Dual-slot Battery Charger for GoPro HD Hero 4 features two slots that allow you to charge two batteries at the same time. Moreover， it is built with smart auto detection that enables simultaneous adjustment of charging current. Its USB compatibility allows for convenient charge via most standard USB chargers or a computer. And it has a compact， lightweight size that easily fits in your bag. Click and order right now!                                    Features             Designed specifically for Hero 4 camera batteries<br> Two slots allow you to charge two batteries at the same time<br> Smart auto detection enables simultaneous adjustment of charging current<br> USB compatibility allows for convenient charge via most standard USB chargers or a computer<br> Compact， lightweight size， easy to carry<br> High quality， stable performance <br>                                                            Specifications             Dimensions     (2.36 x 1.77 x 0.78)" / (6 x 4.5 x 2)cm (L x W x H)    <br> Input     5V 2.1A    <br> Output     4.35V 800mA(x2)    <br> Material     PC    <br> Weight     0.95oz / 27g    <br> Color     Black    <br> Compatible with     GoPro HD HERO 4    <br> Model     GP4B     <br>                                                             Package Includes            1 x Dual USB Charger <br>1 x USB Cable<br>