Data Logger Shield for Arduino - SD + RTC breadboard power supply Key details include Working Voltage:

Key details include Working Voltage: 2

and a dark blue PCB that reduces light interference on the onboard LED — making it better for production use

1") breakaway headers

while the load side uses COM

Data Logger Shield for Arduino - SD + RTC breadboard power supply Key details include Working Voltage:Searching for a device that will store your Arduino sensor data into an SD card with timestamps? This Data Logger Shield is perfect for you then! This shield has an SC card interface that supports FAT16 and FAT32 cards. It also has an onboard 3. 3V logic level converter to secure and prevent damages to your SC card. Moreover, the RTC relies on a  coin battery so it stays active even if the shield is not connected to an Arduino. No need to worry