R4-SDHC Revolution for DS(NDSL/NDS), TV Game Cards, r4-sdhc - China (mainland) TV Game Cards, r4-sdhc in TV, Handheld Game Parts & Accessories/n.e.s. on ttnet.net
R4 cartridge - Wikipedia
What software do I need to download to make it work? I found this r4 alongside my Nintendo DS Lite : r/flashcarts