PasoGo is a handheld cartridge based console release by Koei in 1996 and its games are based actually on the the classic Asian game "Go". The name of the console is a combination of Pasocon, which is a shorten word of the phrase "Personal Computer" in Japanese, and the name of the game that is focusing, Go.
PasoGo - Reasons behind the console's commercial failure
However, the console wasn't successful. The initial price was very high, four times the price of the Game Boy Pocket that released the same year. The console itself is too big. The screen is also big with 5.7 inches size and only a little contrast making it playable only in good light conditions.
The game Go also could be found on other video game consoles. Since its games weren't so comprehensive the console could be bought only from Go enthusiasts. But even for them the technology of that era wasn't good enough to mimic the movements of a professional player so the console really didn't have any special feature.
The console uses six AA batteries as a power source or as AC adapter that was released for the system.