Famicom Hard BATTLE BOX BATTLE BOX

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

What is a battle box?
・ Save your own original data.
・ Break into your friends' cassettes and play World War games.
・ Data backup without batteries.
・ Free to carry around. Compact even when connected!
・ In the future, software for battle box will be released one after another.