The R4 SDHC is an adapter so you can use a microSDHC card (up to 32GB) with Your Nintendo DS/ DSLite this allows you to store much more and allows you to benefit from all the following features: - Watch movies - Play music - Browse pictures - Read E-Books and more... Features: - 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 - Supports HC memory 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 - Supports WiFi, DS rumble pack and DS browser.