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I. overview: Raspberry Pi foreign highest precision clock module DS3231 Note that the Arduino motherboard can also use this module. The module itself can adapt to 3.3V and 5V systems without level conversion. This is super convenient. Two. Characteristics: The accuracy of the time interval is from 1.-40 to C to +85 degree C at + 5ppm (+ 0.432 seconds / day). 2. provide battery backup for continuous timing. 3. low power consumption 4. device encapsulation and function compatible with DS3231 5. Complete clock and calendar functions include seconds, minutes, hours, weeks, dates, months and years, and provide leap year compensation that is valid until 2100. 6. two calendar alarm clock 7.1Hz and 32.768kHz output 8. reset output and button to shake the input. 9. high speed (400kHz) I2C serial bus Power supply voltage from 10.+2.3V to +5.5V 11. digital temperature sensor with a precision of + 3 C. Operating temperature range 12.-40 to C +85 to C This link has two attributes, with and without battery, and the buyer will purchase according to his own needs