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GBA SP Headphone Adapter diagram

Image from Nintendo.com displaying the set up for the GBA SP Headphone Adapter

The GBA SP Headphone Adapter connected to the EXT 2 port allowing the standard 3.5mm jack headphones/earbuds to hook up to the GBA SP rather than the specially made GBA SP Headphones. (Due to the fact that the GBA SP did not have a headphone jack.)