Looking for a device to record from an auxiliary port to my iPhone

Hi,
Is there an external mic for iPhone that has a line-in port to record from a radio or an external source without mic noise?
I know there are devices for the Mac like this, but I'd like to be able to record things without background noise from my environment directly to iOS.
There used to be a iPhone guitar amp thing that had a line in port, but it used the 30 pin port, not lightning.
Thanks