This is a small micro SD breakout board The module has built-in level adjustment circuit, which can realize level conversion between 5V and 3.3V microSD Communication interface: standard SPI; the interface voltage is 3.3V or 5V Applicable card type: Micro SD Card Hardware connection: This microsd card is equipped with a level converter, which can not only connect 5v devices other than arduino, but also prevent the SD card from being damaged