Bluetooth Cartridge GBA TX Control Nintendo Switch
This special Bluetooth cartridge by Inside Gadgets lets you use a Game Boy Advance to control your Nintendo Switch. At $89 USD, it’s also compatible with the Game Boy Advance SP, Nintendo DS/DS Lite, GB Micro and even the Analogue Pocket.



The GBA Bluetooth TX Cart is based on the Raspberry Pi Zero 2 board, which means it should work with the Switch (1.0.0+), Switch Lite (v9.0.0+), Windows 10, macOS (10.10+), Android (9.0+) and Raspberry Pi (Bluetooth v2.0+), along with 8BitDo retro receivers. This cartridge boasts a refresh rate of 2ms, which means little to no input lag, and allows you to easily map all of the GBA’s buttons to the connected device. More information here.

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Bluetooth Cartridge GBA TX Control Nintendo Switch

This is a genius idea. It’s anyone’s guess as to why Nintendo themselves hadn’t thought of, or at least bothered making bluetooth controllers that resemble the GB/GBC/GBA,” said one fan.

[Source]