the device can charge (continuous power) 2.1A + 1A, you can also charge unevenly (eg, when one of the USB port is loaded of 1A then second USB port can be loaded up to 2,1A) You can easily charge the iPad, or bigger size tablets. Compatible with iPad / iPhone / iPod / Tablet / Smartphones - 3.1 A (dual USB port: 2.1 A + 1 A) - Input voltage: 12-24V - Protection of countercurrent - Low temperature of functioning - Compact size: 26,8 x52, 5mm - Ability to simultaneously charge two devices - protection of overheating