Nintendo Game Boy Micro has a pixel density of:
144.22

A.K.A.
Released: 2005

Resolution: 240×160 2″ display

Totaling 0.04mp (megapixels) and having a PPI of 144.22

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Game Boy Micro

Also known as	Oxy (code name)[1]
Manufacturer	Nintendo
Product family	Game Boy line
Type	Handheld game console
Generation	Sixth generation era
Release date	JP: September 13, 2005NA: September 19, 2005AU: November 3, 2005EU: November 4, 2005
Lifespan	2005–2008
Discontinued	2008
Units shipped	2.42 million (as of March 31, 2007[update])[2]
Media	Game Pak
CPU	32-bit ARM7TDMI (16.78 MHz)
Predecessor	Game Boy Advance SP (concurrent)
Successor	Nintendo DS

This righthand infobox courtesy of Wikipedia.