Features: _x000D_Memory card interface works with FAT16 or FAT32 formatted cards. _x000D_3.3v level shifter circuitry prevents damage to your memory card. _x000D_Real time clock (RTC) keeps the time going even when unplugged. The battery backup lasts for years. _x000D_Included libraries and example code for both card and RTC mean you can get going quickly Prototyping area for soldering connectors,circuitry or sensors. _x000D_3.3v regulator is both a reliable reference voltage and also reliably runs memory cards that require a lot of power to run. _x000D_Works for Duemilanove,for Diecimila, for Leonardo or ADK/Mega or higher.Not supported for ADK/Mega R2 or lower. _x000D__x000D__x000D_Specifications: _x000D_Size: 7*5.4cm/2.8*2.1in _x000D_Weight: 18g(approx.) _x000D__x000D__x000D_Package Includes: _x000D_1 x Data Logger 1Memory card interface works with FAT16 or FAT32 formatted cards. 23.3v level shifter circuitry prevents damage to your memory card. 3Real time clock (RTC) keeps the time going even when unplugged. The battery backup lasts for years. 4Included libraries and example code for both card and RTC mean you can get going quickly Prototyping area for soldering connectors,circuitry or sensors. 53.3v regulator is both a reliable reference voltage and also reliably runs memory cards that require a lot of power to run.