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Description: DS1307 I2C real time clock chip (RTC) 24C32 32K I2C EEPROM memory Using LIR2032 rechargeable lithium battery with charging circuit Solve the problem of no literacy of the DS1307 with backup battery Support timing 1 year of the DS1307 after fully charged Leads to the DS1307 clock pin provides a clock signal for the microcontroller Other I2C devices can be cascaded Size: 27 x 28 x 8.4mm