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DS3231 Mini RTC Module for Raspberry Pi & Arduino [DS3231] - US $2.50 : HAOYU Electronics : Make Engineers Job Easier
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RTC Etrension board I2C RTC module GPIO PI 3 Compatible with Raspberry Pi 4B/3B+/3B/Zero Series - AliExpress
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Witty Pi 4 HAT - RTC & Power Management for Raspberry Pi : ID 5704 : $37.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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