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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