Last console of the Game Boy line

Release date: September 13, 2005 (Japan)
CPU: 32-bit / 16.8 MHz ARM processor (ARM7TDMI)
ROM: 4 Mb, 8 Mb, 16 Mb and 32 Mb cartridges
Display: 240×160 pixels, 2 inches (51 mm) / Backlight TFT color LCD
Color palette: 512 colors from a palette of up to 32,768 colors
Dimensions: 101 mm (W) x 50 mm (H) x 17,2 mm (D) / 4″ x 2″ 0.7″
Battery: built-in rechargeable lithium-ion battery (~8 hours)

More information @ wikipedia.org
Nintendo Game Boy Micro Repair Manual @ ifixit.com