5 USB output Charger

Malin this case with 5 USB outputs when smartphone and tablet invade our homes.
A single electrical outlet to charge up to 5 devices.
Where here becomes less top is that the unit has 2 outputs 2.1 A; 1 output 1.3 A and 2 outputs 1 A, but with a maximum total of 5 A.
Find the error and tell me how you get to 5 A.
2 times are 4.2 A and 2.1 we can not add anything.
2.1 + 1.3 + 4.5 1 form A, etc. It only happens if 4.5 A max does not exceed 5 A.
But perhaps I nitpick because the devices do not just 1 A. Nevertheless load at optimum value limits the number of simultaneous outputs, and one wonders if chargers 5 5 2 A not pressed more for an equivalent price.
His big interest, it monopolizes a socket and is more compact than against 5.The no light signals if it is turned on and the output is connected.
I rebooted a 10-inch Galaxy Note 2014 edition with output 2.1 A with a time charge identical to that obtained with the original.