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If you loved the M3 DS Simply then show the NDS R4 some love. The R4 cartridge is physically identical to the M3 DS Simply in fact they are produced by the same factory. Initial quantities are limited so if you want in on the R4 revolution then place your order today.

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The R4DS Cartridge is a DS SLOT-1 flash cart. This amazing little device matches the original DS cart size. It is a complete solution with no need to purchase any additional components or deal with any messy software and truly a easy media enhancer for DS and DS Lite.

• Original DS cart sized device
• Drag and drop files, NO software required
• Play in SLOT-1 without Passcard or Flashme
• Supports TF(MicroSD) capacity up to 4GB(32Gbit)
• Supports DS sleep mode
• Supports FAT16/32 File System
• Supports Screen touch sensitive
• Compatible clean Rom, homebrew and moonshell
• Compatible all version of DS
• Intuitively upgradeable custom operating system.

Source: http://www.r4ds.com/index-en.htm