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Real Time Clock (RTC) DS1307 Module SKU: 1791 BIN: 2-10-03-07-10
Real Time Clock (RTC) DS1302 Module SKU: 2409 BIN: 2-10-04-09-04
Adafruit PCF8523 Real Time Clock Assembled Breakout Board SKU: 2352 BIN: 2-10-04-22-02