Features Wide Application: The memory card interface is suitable for FAT16 or FAT32 formatted cards. Compatible with Duemilanove, Diecimila, Leonardo or ADK/Mega or higher. ADK/Mega R2 or lower is not supported, all basic needs users are covered. What it Does: The 3.3v voltage regulator is both a reliable reference voltage and can reliably run memory cards that require a lot of power to operate. The 3.3v level shifter circuit prevents damage to your memory card. Running: The real-time clock (RTC) keeps time running even when unplugged. Backup batteries last for years. Included libraries and example code for cards and RTCs means you can get up and running quickly, prototyping areas for soldering connectors, circuits or sensors. Durable Material: The data logging shielding module is made of high-quality materials, with high precision, stable performance, high sensitivity, long-term use, and battery backup that lasts for many years, allowing users to own and use it with confidence. Large Recording Capacity: Record up to 100,000 temperature points and 100,000 humidity points, automatically generate PDF reports without software, and provide audible and visual alerts, on-screen indications when temperature or humidity drifts. Features: 1.Memory card interface works with FAT16 or FAT32 formatted cards. 2.3.3v level shifter circuitry prevents damage to your memory card. 3.Real time clock (RTC) keeps the time going even when unplugged. The battery backup lasts for years. 4.Included libraries and example code for both card and RTC mean you can get going quickly Prototyping area for soldering connectors,circuitry or sensors. 5.3.3v regulator is both a reliable reference voltage and also reliably runs memory cards that require a lot of power to run. 6.Works for Duemilanove,for Diecimila, for Leonardo or ADK/Mega or higher.Not supported for ADK/Mega R2 or lower. Specifications: Size: 7*5.4cm/2.8*2.1in Weight: 18g(approx.) Package Includes: 1 x Data Logger Package List