Not just a simple breakout board, this microSD adapter goes the extra mile - designed for ease of use.

• Onboard 5v->3v regulator provides 150mA for power-hungry cards
• 3v level shifting means you can use this with ease on either 3v or 5v systems
• Uses a proper level shifting chip, not resistors: less problems, and faster read/write access
• Use 3 or 4 digital pins to read and write 2Gb+ of storage!
• Activity LED lights up when the SD card is being read or written
• Four #2 mounting holes
• Push-push socket with card slightly over the edge of the PCB so its easy to insert and remove
• Comes with 0.1" header (unattached) so you can get it on a breadboard or use wires - your choice
• Tested and assembled here at the Adafruit factory
• Works great with Arduino, with tons of example code and wiring diagrams