AHDBT-401 Dual 4.2V 800mA Li-ion Battery Slots Power Charger For GoPro HD Hero 4Features:Conveniently Charge your HERO4 camera batteries with the Dual Battery Charger、 allows you to charge two batteries simultaneouslyFeaturing USB compatibility、 you can power it with most standard USB chargers、 the GoPro Wall or Auto Charger、 or a computerDual LED indicator lights display the charging status、 so you know when your batteries are ready for actionInput: 5V 2AOutput: 4.2V 800mA*2 800mA*1Charger Size: Approx. 4.2cm x 3cm x 4.2cm \/ 1.65 x 1.18 x 1.65 inchCable Length: Approx. 33cm \/ 12.99 inchPackage Included: 1 x AHDBT-401 Dual Battery Charger1 x USB CableDetail Pictures: