Original GBA SP Link Cable & USB Charger with 3.5mm Headphone Adapter - 2 Player Game Link Cable for Gameboy Advance SP - Perfect for Multiplayer Gaming & Audio Playback

I tested all 3 cables and they all appear to function as described, including trading two Pokémon back and forth between a GBA and a GBA SP.If you plan on using the GBA SP headphone adapter a lot; like the original GBA, the GBA SP does not have perfectly "clean" audio. Mileage may vary from unit to unit, but mine has a very slight hum but it's very easy to ignore while there is game audio playing. (Considering my GBA SP is a water-damaged unit I "rescued" and outfitted with a new IPS display, I guess I'm surprised it isn't worse!)Referencing some of the other reviews I saw on this product before ordering:I did not experience any need to file off the metal bumps that help the cables stay in the ports; they are a little stiff to insert, but certainly not so much that I thought I was going to break anything. I imagine this would be particularly desirable for the link cable if you and a friend still frequently play GBA link games together. After repeated use the stiffness might "break in" making them easier to use, but you certainly would not want the opposite extreme and have them falling out on their own!