This module is compatible w/ Arduino Shield interface; Use the on-board toggle switch to select the SD card type. Directly plug into the Arduino UNO motherboard Arduino MEGA 2560 or other motherboard to extend space of data storage; Easily reading / writing file via the file system(SD library of Arduino IDE); Widely used in digital phone albums sensor long time / high frequency adopting system text reader that needs large amount of data storage; Standard Arduino expansion board interface compatible with Arduino UNO Arduino MEGA2560 and Arduino compatible boards; On-board level conversion circuit namely the interface logic level can be 5V or 3.3V; Communication interface is standard SPI only support SPI mode; Supports SD card Micro SD card and SDHC card; 4.5~5.5 DC power supply