AHDBT-401 Dual 4.2V 800mA Li-ion Battery Slots Power Charger

Features:
Conveniently Charge your HERO4 camera batteries with the Dual Battery Charger, allows you to charge two batteries simultaneously
Featuring USB compatibility, you can power it with most standard USB chargers, the Auto Charger, or a computer
Dual LED indicator lights display the charging status, so you know when your batteries are ready for action
Input: 5V 2A
Output: 4.2V 800mA*2 800mA*1
Charger Size: Approx. 4.2cm x 3cm x 4.2cm / 1.65 x 1.18 x 1.65 inch
Cable Length: Approx. 33cm / 12.99 inch

Package Included:
1 x AHDBT-401 Dual Battery Charger
1 x USB Cable

Detail Pictures: