HiLetgo Stackable SD Card and TF Card Shield for Arduino UNO R3 Arduino Mega 2560 This SD card shield is a standard SD card / TF card break out board for Arduino. The SD card shield adds storage to your Arduino project. Stackable SD Card Shield is a stackable design Arduino SD / TF card expansion board. It supports direct insertion in the Arduino board to extend SD / TF read and write functions. SD / TF card expansion board uses the Arduino hardware ISP interface, so only supports SIP mode SD / TF card. This expansion board uses only a handful of Arduino pins, so the stack design allows you to plug in another expansion board on this board, provided that the same SPI pins are not used, such as Bluetooth expansion board, GPRS expansion board. Many electronic enthusiasts have provided Arduino with a simple documentation program. And we provide a simple TinyFAT file system library, you can easily achieve Arduino control SD / TF card reader - this library only supports FAT16 small capacity card, such as 1G card, if you need to support FAT32, you can use Arduino heard Official library.