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USB ports and connectors are often color-coded to distinguish their different functions and USB versions.

These colors are not part of the USB specification and can vary between manufacturers; for example, USB 3.0 specification mandates appropriate color-coding while it only recommends blue inserts for Standard-A USB 3.0 connectors and plugs.

 

USB 1.x                White

USB 2.0                Black, sometimes white

USB 3.0                Blue

Sleep-and-charge        Yellow or red