Boho Tronics Standard Slim Lithium Ion Battery Wall Dock Travel Home USB Charger - Compatible With Samsung Galaxy S2 SII i9100 Intelligent dedicated battery charger with USB output. When the battery is fully charged,automatically stop charging. Safety cut out circuit,Built-in protection circuit prevents overcharging. Constant current,constant voltage charging,automatic identification. This travel charger can be used anywhere in the world with the U.S version 2pin style plug