I'd be willing to bet that because this isn't really considered USB in terms of specifications, only the connector, they can push whatever they want. IPads for sure pulls 2A when connected to a wall charger but can't pull that when connected to a computer USB port. It's more about what the device wants to pull and whether the supply can provide that much current.

bimmer4WDrift wrote:But is it 2.2A per USB?

Yes. Should be able to charge 3 tablet size devices at full speed simultaneously.

But is it 2.2A per USB?

6.6A should be more than enough. I have a 5A Tom-Tom superfast in-car charger and it keeps waze running while recharging the phone's battery to 100%. The normal 2.5A in-car chargers can't meet the demands that are generated by the GPS running and trying to recharge the battery on the move.

Ian.

That may be a little exaggerated.

Wikipedia wrote:A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A device may draw a maximum of five unit loads (500 mA) from a port in USB 2.0, or six unit loads (900 mA) in USB 3.0.
...
a charging port can supply currents between 500 mA and 1.5 A

So with 3 USB ports, the most that can be drawn is 4.5A at approximately 5V. Whilst the charger probably isn't USB certified, anything you connect to it probably is, so shouldn't draw more than the maximum current.