The R4 DS Cartridge is top-of-the-line in DS SLOT-1 flash carts. It's an amazing little device and a complete solution that required no purchase of any additional components. Say - it is an easiest media enhancer.
1)2nd generation storage device (no booting tool required), 2)Flush fitting slot 1 card, 3)Uses MicroSD card, FAT16 or 32 , 4)Supports any MicroSD card speed with no lag in game, 5)Supports Clean ROM, drag and drop. Works on any OS, 6)Built in NoPass, 7)Automatically detect save type, 8)Save directly to MicroSD card, not to onboard chip, 9)Supports Moonshell and other homebrew. Open I/O interface, 10)User friendly skinnable interface. Touchscreen or button operation, 11)Supports rumble pak and memory pak, 12)Supports the WiFi game, DS Rumble Pak, DS Browser, 13)Supports changes of the background of Operation Interface, 14)Support Skin DIY by setting background and font colors on Main Menu and Game Menu manually and automatically, 15)Supports 4-scale-lightness adjustment ( DS Lite only ), 16)Supports the Soft Reset. 17)Supports Action Replay