EDGE is a multi functional media adapter for NDS. It accepts Micro SD and Micro SDHC cards. EDGE allows use of Homebrew DS applications, multimedia (via Moonshell) and commercial NDS applications via the SD interface. EDGE is easy to use, just load the EDGE OS (download from support section) onto the MicroSD together with your favourite applications, plug into EDGE then insert the EDGE cartridge into the DS and you're ready to go!