GOOQ 12V 3.6A AC Adapter for Microsoft Surface Pro2 Tablet PC Black (Pro AC Adapter No.1) With the Protection of Overcharging. Easy to carry around on the trip and travel. Voltage Stability, please feel free to use. Intelligent IC chip inside recognizes a fully charged battery and automatically switches to a saver mode to prevent overcharging and short circuit Input: 100-240V 50/60HZ Output:: DC 12V 3.6A