deciption: 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 Compact Flash Card Reader to transfer and convert you movie & music files to the Compact Flash Cards. Then, insert M3 Adapter with CF/SD 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. One of the coolest feature of a M3 Adapter is that you can directly run third party software on it ? that includes emulators of the video game system. NES, FC ,SNES, GB, GBC, SMS, GG, PCE Rom and more...