M3 DS Real, M3 adapter
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M3 Adapter is an amazing product for those who want to download free games, movies and music from a PC to a GBA(SP) / 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 games, movies instead of playing music only. eg. Support playing over thousands of homebrew games.
One of the coolest feature of a M3 Adapter is that you can directly run homebrew software on it that includes emulators, PDA, browser etc. . .
Excellent homebrew support, Create your own games or programs.