Raspberry Pi foreign highest precision clock module DS3231
Note that this module can also be used for Arduino motherboard.
Note this module doesn't have battery holder and battery.
The module itself can adapt to 3.3V and 5V systems without level conversion, which is super convenient.

Characteristic:
1. In the temperature range of -40°C to +85°C, the timing accuracy is maintained at ±5ppm (±0.432 seconds/day)
2. Provide battery backup for continuous timing
3. Low power consumption
4. Device package and function are compatible with DS3231
5. The complete clock calendar function includes seconds, minutes, hours, week, date, month and year timing, and provides leap year compensation valid to 2100 years
6. Two calendar alarm clocks
7.1Hz and 32.768kHz output
8. Reset output and button debounce input
9. High-speed (400kHz) I2C serial bus
10.+2.3V to +5.5V supply voltage
11. Digital temperature sensor with accuracy of ±3°C
12. -40°C to +85°C operating temperature range
13.16-pin SO (300mil) package

Package included:
1 x DS3231 Real Time Clock Module Low Power Precision RTC
Instructions/schematic are NOT included. We don't provide technical assistance please make sure that you are familiar with the product before purchasing.