Adafruit PiRTC - Precise DS3231 Real Time Clock for Raspberry Pi
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Product Details
Best battery-backed RTC you can get that allows your Raspberry Pi project to keep track of time if the power is lost||Perfect for data-logging, clock-building, NTP servers, time-stamping, timers and alarms||100% genuine Maxim DS3231 board||Works perfectly with any Raspberry Pi (Pi 1, Pi 2, Pi 3, Pi 4, Pi Zero, A+, B+ etc.)