Hi

The always on usb often found on laptops etc .
Is what it says .
That is power is always available to charge phones lights etc even when the pc is switched of.
Be aware that if it is a laptop is running on battery this will use your laptop battery power to charge your phone.
Handy if you don’t have mains, say in a caravan but don’t want your whole laptop running .
Just be careful not to use all your laptop battery up .
Hope this helps
Mike


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