The rumble pak for the Nintendo DS looks just like a Game Boy Advance cartridge | Did you know the Nintendo DS had a rumble pak? | By DKOldies.com | Alright, So
M3 DS REAL for Nintendo DS(DS Lite) Flash Card + Rumble Pack EUR 9,99 - PicClick IT
Rumble Pak - Wikipedia
Comparing DS RUMBLE Paks - Nintendo Rumble Pak vs DS LITE (flush) Pak - YouTube
Brand new Nintendo DS rumble pak, Video Gaming, Gaming Accessories on Carousell