Features: Compact Portable Design, Convenient for travelers and business users. This battery charger is a handy companion for digital shooting Charge your battery with any USB-enabled smart products. 2 battery Slot, you can charger 2 battery at the same time Quick charge with automatic constant current control prevents battery from overcharging, short circuit, and electronic shock Smart LED indicator shows charging status(green and red) Compatible With: For GoPro AHDBT-201/AHDBT-301 Description: New generic Rechargeable Li-ion Battery Extra power for your digital video camera / camcorder High energy density, high recycle life, long life battery, 72  hours aging test High capacity / rechargeable Li-ion battery with supper power cell technology High efficiency of power conversion. No memory effect. Safe and reliable, perfect for using on travelling and outdoor activities. Safety circuit design, over charge protection, over-discharge protection, shortage protection.  Specifications: Dual-slot USB Charger Input: DC 5V 2A Output: DC 4.2V 800mA(X2) Size: 43x34x24mm Battery Pack Voltage: 3.7V Battery Capacity: 1600mAh Power: 5.9Wh Size: 35x28x12mm Suitable Model: For Gopro Hero 3/3+   Package Included: 1 x Dual-slot Charger(With USB Cable) 2 x AHDBT-301 batteries