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This is a Super Capacitor Real-Time Clock module, it design for Raspberry Pi, but it also can be used to Arduino. Pluging it into Raspberry Pi GPIO interface, and all is ok. This is the easiest way to keep it in time.
Features:
-40 C to + 85 C temperature range, timing accuracy is maintained at 5ppm ( 0.432 seconds / day)
Continuous Timekeeping Battery Backup
Low power consumption
The device package, and functionally compatible with the DS3231
The complete clock calendar functions include seconds, minutes, hours, day, date, month and year time, and provide valid until 2100 Leap Year Compensation