DS3231 Precision RTC Breakout -STEMMA QT/Qwiic

This is the DS3231 Precision RTC in a compact, breadboard-friendly breakout: It has an extremely accurate I2C-integrated Real Time Clock (RTC) with a Temperature Compensated Crystal Oscillator (TCXO). With a CR1220 12mm coin cell (not included) plugged in, you can get years of precision timekeeping, even when main power is lost.

More information is available on the website of Adafruit.