GTMax USB 2.0 A to Micro-USB for T-Mobile Samsung Vibrant SGH-t959 GSM Cellphone Uses USB connection for power source. No need to bring AC Adapter and cradle during travel. 1 Sync-Charger for 2 functions, save space for your home and office Light Weight, compact, stylish, convenience. In order for your usb data cable to perform the above functions, you must obtain the required software independently.