Review on 🔌 SDHC Dual Core Adapter with 16GB Micro SD and USB – Compatible with DS, DSi, 2DS, 3DS, DSi XL, 2DS XL, 3DS XL (2020 Version) by Polo Acri

Works great, but be sure to replace the file (*.dat) to remove the "time bomb" built into the card's operating system, which only kills the R4 card after 12-24 months renders activation useless. I can only assume it's on the card to make you want to buy another card next year if you're not too computer savvy. Just google it and you will find many YouTube videos showing how to do it. Aside from that little hiccup, everything works great and it's nice to have a backup of all my DS games on a single SD card instead of carrying all my game cartridges around. Works on both my NDS-Lite and my 3DS XL. Although the card only works in "DS mode" when inserted into a 3DS/2DS.