Power supply for the nano

Hi I have a project that runs off a nano, at the moment the power is via usb. In the finished model I would like to power the nano directly from a 5v power supply rather than the usb.

I note that the board has Vin can anyone advise if this input is via a regulator and can be used with say a 9v supply to power the board.

There is of course the +5v, would I be able to power the board via this pin or is this 5v out.

Thanks

Jim

Power it from 5V using the 5V pin.
Powering from Vin goes thru the 5V regulator - 5V in won't provide 5V out.