Smart Port Design: 3-USB output can charge one tablet and two smartphone or 3 smartphones at the high speed, you can get 3 digital devices with 5V input charged at once for total efficiency, automatically detects your devices to deliver optimum charging speed. Charger: Output: DC 5V 3.1Amp; Input: AC 100V - 240V (U.S. & World Standard).Best replacement for original charger, work with any device with a USB port.