Dsloger New Tiny RTC I2C AT24C32 DS1307 Real Time Clock Module Board for Arduino DS1307 I2C real time clock chip (RTC)24C32 32K I2C EEPROM memoryUsing LIR2032 rechargeable lithium battery with charging circuitSolve the problem of no literacy of the DS1307 with backup batterySupport timing 1 year of the DS1307 after fully chargedLeads to the DS1307 clock pin provides a clock signal for the microcontrollerOther I2C devices can be cascadedSize: 27 x 28 x 8.4mm / 1.06 x 1.10 x 0.33inchPackage Include: 1 x DS1307 Real Time Clock Module