- 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
- Size:68x53x23mm(approx)