Features:

• Cards formatted in FAT16 or FAT32 can be used with the SD card interface. 3.3 volt level shifter circuitry built in allows for extremely quick reading and writing while guarding against SD card damage.
• Even after the Arduino is disconnected, the real-time clock (RTC) continues to run the time.
• The backup coin cell battery lasts for many years.
• You may get started right away because SD and RTC example code and libraries are included.
• Soldering connections, circuits, or sensors in a prototyping area.
• Two LEDs that can be configured as indicators
  In addition to serving as a dependable reference voltage, the onboard 3.3 volt regulator also steadily powers SD cards that consume a lot of energy.
• It is compatible with a wide range of Arduinos and Arduino-compatibles since it uses the "R3 layout" for I2C and ICSP/SPI ports.