I know you didn't ask this, but the screen res, sharpness, and colours are superb.
With the same 320-by-240-pixel resolution as the screen on the iPod classic, the nanos display features the highest pixel density of any display Apple has ever produced and the screen is also 65 percent brighter than that of the previous nano, according to the company. However, its made of the same material as that of previous iPods, rather than the more-durable optical glass used on the iPhone and iPod touch.