Features:Compact Portable Design, Convenient for travelers and business users.This battery charger is a handy companion for digital shootingCharge your battery with any USB-enabled smart products.2 battery Slot, you can charger 2 battery at the same timeQuick charge with automatic constant current control prevents battery from overcharging, short circuit, and electronic shockSmart LED indicator shows charging status(green and red)Compatible With: For GoPro AHDBT-201/AHDBT-301Description:New generic Rechargeable Li-ion BatteryExtra power for your digital video camera / camcorderHigh energy density, high recycle life, long life battery, 72  hours aging testHigh capacity / rechargeable Li-ion battery with supper power cell technologyHigh 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 ChargerInput: DC 5V 2AOutput: DC 4.2V 800mA(X2)Size: 43x34x24mmBattery PackVoltage: 3.7VBattery Capacity: 1600mAhPower: 5.9WhSize: 35x28x12mmSuitable Model: For Gopro Hero 3/3+  Package Included:1 x Dual-slot Charger(With USB Cable)2 x AHDBT-301 batteries