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

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The Bandai WonderSwan — Gunpei Yokoi’s Last Console

The Bandai WonderSwan, released in Japan in March 1999, was designed by Gunpei Yokoi — the legendary Nintendo engineer who created the Game Boy, Metroid, and Donkey Kong — working through his Koto Laboratory company after leaving Nintendo. The original monochrome WonderSwan used a NEC V30MZ processor at 3.072 MHz and featured a unique design playable both horizontally and vertically. Its exceptionally long battery life (one AA battery for approximately 40 hours) and low price made it a credible Game Boy Color competitor in Japan. Gunpei Yokoi died in a traffic accident in October 1997, two years before his final console launched.