Bandai WonderSwan BW

I have main unit (CIB).

type handheld game console
country Japan
os woderswan
cpu NEC V20 16bit
speed 3.072 MHz
ram 512 KB
rom max 512 MB
graphic LCD 2.49″ 224 x 144
colors B/W
sound mono
battery 1*AAA, 30 hours
ports cartridge, ext. port