Product Features:
  • 2 channel allows you to charge 2 batteries at the same time
  • Storage box for conveniently storing 2 extra batteries
  • LED indicator shows the charging status, red - charging in process; green - completed
  • Automatic constant current control, prevents battery from overcharging, short circuit, and electronic shock
  • Charger and cable only, No Battery Included!
Specifications:

Input : 5V/2A
Output: 4.4V/1A(X2)
Compatibility: For GoPro Hero 5 Only, Not for other model. 

Inside the package:
1 x USB Dual Port Slot Charger Charging Dock for GoPro Hero 5 
1 x USB Cable