Features: 100% BRAND NEW! 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 runWorks with Arduino UNO, Duemilanove, Diecimila, Leonardo or ADK/Mega R3 or higher. ADK/Mega R2 or lower are not supported Note:Battery is CR1220 3V,we ship without battery!Hope you can understand. Package Included: 2 PCS*Data Module Logging Shield Data Recorder Shield for Arduino UNO SD Card

If You Are Not Satisfied with Your Purchase for Any Reason, Please Feel Free To Contact Us at the Buyer Center or Support Email, 24/7 Quick Reply. Package Included: 2 PCS*Data Module Logging Shield Data Recorder Shield for Arduino UNO SD Card. Onboard 3.3v regulator is both a reliable reference voltage and also reliably runs SD cards that require a lot of power to run. Real time clock (RTC) keeps the time going even when the Arduino is unplugged. The battery backup lasts for years. SD card interface works with FAT16 or FAT32 formatted cards. 3.3v level shifter circuitry prevents damage to your SD card.