Data Sync & Charging OTG Dock + ''2500mAh'' Replacement Battery + Cable for Samsung Galaxy S3 i9300
Charging dock functions: support for data transmission charging synchronous/backup battery charging function Support USB OTG function. 2500mAh replacement battery(actual capacity is 2300mAh). Voltage: 3.7V. Replace for damaged wear and tear or loss of the original battery.