When you buy a new DS lite some kind of placeholder is sitting in slot 2 of the DS. It appears to have electrical contacts but I can not find any documentation anywhere that says what it does, if anything.
It's simply there to plug the port (protect it from dust) when you don't have a GBA game in it. There's no real purpose to it, it just makes the device look more complete, rather than having a huge hole on the bottom.
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