3pcs Mini High Precision 3.3V/5V Real Time Clock Module Memory Module for Arduino Raspberry Pi

Features:
Can be adapted to the system in 3.3V and 5V without level conversion.
Timing accuracy is maintained at 5ppm(0.432 sec/day) within the temperature range of -40C to +85C.
Can provide battery backup for continuous timing.
Device encapsulation and functionality are compatible with the DS3231.
Includes two calendar alarm clocks.
Low power consumption, 16-pin SO(300mil) package, reset output and buttons input.
Complete clock calendar functions include seconds, minutes, hours, weeks, dates, months and years, and provide leap year compensation until 2100.
Includes high-speed(400kHz)I2C serial bus.