Don't buy this. The Retro-bit RetroPORT adapter is a horrible piece of shit that will play your PAL NES games too fast and will fuck up the sound of most NTSC games. :
Amazon.com: Retro-Bit Legacy GC Wired Controller - for Gamecube & Wii - Black : Video Games
Any idea if these gba to snes adapters are safe for snes? Someone mentioned they use more electric than a snes can normally handle and shortens their life by alot : r/snes
LegacyGC Wired Controller (Jet Black)
Super Retro Advance Adapter Review - Gamester81 - YouTube