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: fewer 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 at the Adafruit factory
 Works great with Arduino, with tons of example code and wiring diagrams
 
 To use with an Arduino, connect: 
 
 
 GND to ground
 
 5V to 5V
 
 CLK to pin 13
 
 DO to pin 12
 
 DI to pin 11
 
 CS to pin 10
 
 Then you can use the Arduino IDE's SD library which supports FAT and FAT32 SD cards. For details on getting started, check out Adafruits detailed tutorial which discusses microSD cards, wiring and how to use this breakout board with an Arduino
 TECHNICAL DETAILS
 Datasheet, EagleCAD, and fritzing available in the product tutorial
 Dimensions (without 0.1" header):
 
 Length: 31.85mm/1.25in
 Width: 25.4mm/1.00in
 Height: 3.75mm/0.15in
 Weight: 3.43g/0.12oz