The R4DS Adapter accepts HC (high capacity) cards it is the latest development in flash cartridge technology for the Nintendo DS and Nintendo DS Lite.
The R4 is an adapter so you can use a micro SD Card with Your Nintendo DS/Lite this allows you to store much more and allows you to benefit from all the below features:-
Watch movies, play music, browse pictures, read E-Books and more...
Same size as an original DS game cartridge
Built-in PassMe (NO need for any boot cart/passcard etc.)
Uses microSD memory card (Trans Flash) as storage.
Boot clean dump images (downloadable from internet)
Very simple to use: drag and drop files to the microSD card and play
Standard FAT system support
Supports different speeds of micro SD cards
Runs games without any lag or slow down
Upgradable Firmware ( OS / Bios / Kernel )
Touch screen control and robust skinning support
No battery needed, back up the save file directly into the microSD card: Never lose your saved games
Auto detect the save type and automatically generate saver file
Homebrew support , IO lib available on launch
Watch movies directly, listen to MP3s and read TXT on the DS via the use of Moonshell
Supports WiFi, DS rumble pack and DS browser.
1x R4 DS Card (Slot-1)
1x USB microSD memory card reader / writer
1x R4/M3/N5 software
1 x case & lanyard
2GB Micro SD Card