This is a great battery-backed real time clock (RTC) that allows your Raspberry Pi project to keep track of time if the power is lost. Perfect for data-logging, clock-building, time-stamping, timers and alarms, etc. Equipped with PCF8523 RTC, it works great with the Raspberry Pi and has native kernel support. https://elecena.pl/product/17501516/adafruit-pirtc-pcf8523-real-time-clock-for-raspberry-pi 2021-04-07 https://elecena.pl/product/17501516/adafruit-pirtc-pcf8523-real-time-clock-for-raspberry-pi 2022-04-29