Thank u all , out of curiosity though I was hoping to understand how does it have 12 and 5 Volts, does that mean if you plug in a device that uses. 5 it only sends. 5? But could go up to 12 if the devices demanded so?
All USB ports are 5v. As stated, it is the amperage that varies from device to device. The USB 3.0 ports on Macs and PCs are generally 2.1A. USB 2.0 ports on most other computer devices (including the PS3) are 0.5A, though some PCs offer 'hi-power' 1.5-1.8A USB ports.
The iPhone charging plug is 1.5A, while the iPad charging plug is 2.1A.