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Witty Pi 4 Mini - RTC & Power Management for Raspberry Pi : ID 5038 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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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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Amazon.com: for Raspberry Pi Compute Module 4,Mini Base Board (B) with Real-Time Clock and Raspberry Pi 40PIN GPIO Header, Onboard Multiple Connectors (CSI/DSI/RTC/FAN/HDMI/RJ45,etc) : Electronics
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Amazon.com: MakerFocus Raspberry Pi RTC Module DS1307 Real Time Clock Module with BAT and Coin Battery for Raspberry Pi : Electronics
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