WonderSwan Color Console Crystal Blue Digimon Battle Spirit Bundle

Purchased at the time of its new release, I used it for about 2-3 years before it became unused and has been stored since then.
As it was used during my childhood, there are corresponding scratches on the screen and casing.
Please check the condition thoroughly in the product photos before considering a purchase.
It can still be played by inserting batteries and a cartridge.
The screen is very dark, but it is unclear whether it was dark from the beginning or due to deterioration.
The sound from the speaker also seems to be fine.
I am not considering selling it separately.