Fenzer White USB Data Sync Charger Cable Portable Battery Extender for Samsung SPH i325 Ace m300 m340 Mantra m510 m520 m800 m810 s30 Instinct z400 Fenzer White USB Data Sync Charger Cable Portable Battery Extender for Samsung SPH i325 Ace m300 m340 Mantra m510 m520 m800 m810 s30 Instinct z400 Built in IC chip to protect against overcharging Charges battery and provides backup power USB Port and built in LED flashlight Uses two AA batteries (batteries not included)