Features:
● Realtime clock (RTC) to maintain the time, even when the Arduino is unplugged.Backup battery can last for years
● Including SD card and RTC libraries
● Welded joints, circuits or sensors prototyping area.
● Built-in 3.3V regulator is a reliable reference voltage, and a reliable operation, requires a lot of power to run the SD card.
● Compatible with Arduino UNO, Duemilanove, Diecimila, Leonardo or ADK / Mega R3 or higher.
ADK/MEGA R2 or lower is not supported.
 
Resources: 
1. Logger Shield: Datalogging for Arduino
2. RTC Data Logger Shield v1.1