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- SD card interface works with FAT16 or FAT32 formatted cards. 3.3v level shifter circuitry prevents damage to your SD card. - Real time clock (RTC) keeps the time going even when the Arduino is unplugged. The battery backup lasts for years - Included libraries and example code for both SD and RTC mean you can get going quickly - Prototyping area for soldering connectors, circuitry or sensors. - Onboard 3.3v regulator is both a reliable reference voltage and also reliably runs SD cards that require a lot of power to run - Works with Arduino UNO, Duemilanove, Diecimila, Leonardo or ADK/Mega R3 or higher. ADK/Mega R2 or lower are not supported.