Please read over all the details and see pic:

Game has been tested and works. Operation confirmed! 
Version/Region: NTSC - Japanese
Format / System: Nintendo Game Boy Color (GB consoles are all region free)
Condition: Very Good

This is for Game Cart only - Game will be packed in a plastic sleeve.
Shipping USPS First Class Mail

Please note: Save battery inside is dead due to age of the hardware. You will likely need to replace 
it with a new battery in order to save your game. 
Some games have a backup battery inside for saving game data. Since Game Boy games are very old, you should assume
the battery is dead. There is plenty of information available online for replacing the battery, please refer to those.