Real Time Clock Shield for the ODROID-C5, C4 and C2 Attach this RTC Shield to the GPIO header on the ODROID-C5/C4/C2 to keep time when the SBC is offline. The Lithium coin battery can keep the RTC chip running for 3 to 4 years (Battery life is estimated under normal RTC usage conditions. Batteries are installed in the RTC shield by the manufacturer and may show slight variations in initial voltage depending on storage time before the product is used). Compatible with the official ODROID-C5/C4/C2 cases and many other cases. KEY FEATURES CR2032 coin cell, replaceable Dimensions: 20 x 20 x 13.5 mm NOTES Linux: Add the PCF7563 RTC driver Android: Update the OS to release 1.4 or newer LINKS Wiki - https://wiki.odroid.com/accessory/add-on_boards/rtc_shield Warranty is valid for two weeks, starting upon date of receipt.