Feature:1. Two 1400m Ah batteries & dual slot charger for Xiaomi Yi 4K action camera 2. Dual charging slot, can charge two batteries at the same time 3. Fit for Xiaomi Yi 4K camera 4. Using a high quality electric core 5. Built in PCM intelligent battery protection circuit, with anti over charge, discharge, over heat protection function Specification: Charger Band TELESINInput 5V/2A800m A * 2 Output 4.2V800m A * 2 Suitable Battery The bettery of Xiaomi Yi 4K sport camera Input Interface Mini USBBettery Band TELESINInput Valtage 3.85 V Capacity 1400m Ah Size 35.5mm * 35.5mm * 10.5mm Fit for Xiaomi Yi 4K sport camera Package Included:2 X 1400m Ah Batteries 1 X Dual Charger 1 X USB (Universal Serial Bus) Cable