The SD card shield adds storage to your Arduino project. It supports SD, SDHC, or MicroSD TF cards. Use the on-board toggle switch to select the SD card type.And when you want plug a sd card on it,you should select the switch to the right direction. It just uses the SPI ports of Arduino,and you can plug more other shield on it.There are I2C grove and UART grove port on board. Features Arduino and Seeeduino compatible ( Do not compatible with Mega) Grove compatible SD card, Micro SD card and SDHC card supportable 3.3v and 5v logical voltage compatible 2.6~3.6v DC power supply

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