4 pcs ds3231 high precision rtc clock module memory module for raspberry pi

-40 degrees celsius to +85 degrees celsius temperature range, timing accuracy kept at ± 5ppm (± 0.432 sec / day) the module itself can be adapted to 3.3 v and 5 v system complete clock calendar functions include seconds, minutes, hours, day, date, month and year timing , provide valid until the year 2100 leap year compensation 1 hz and 32.768 khz output accuracy of ±3 degrees celsius digital temperature sensor.syi