M3 Adapter is an amazing product for those who want to download homemade games, watch movies and listen music from a PC to a NDS. You can use your PC and normal SD/TF Card Reader to transfer your movie & music files to SD/TF card. Then, insert M3 Adapter with SD/TF Card into GBA(SP) / NDS, and it will be available after boot up the console.Its feature just the same as any other MP3 Player on the market but also playing the opensource/license free games, movies instead of playing music only. eg. Support playing over thousands of homebrew games.