1、‑40 ° C to +85 ° C temperature range, timing accuracy kept at ± 5ppm (± 0.432 sec / day) 2、The module itself can be adapted to 3 V and 5 V system 3、Complete clock calendar functions include seconds, minutes, hours, day, date, month and year timing , provide valid until the year 2100 leap year compensation 4、1 Hz and 3768 kHz output 5、Accuracy of ±3℃ digital temperature sensor Features: -40 ° C to +85 ° C 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 RTC Clock Module has the characteristic of low power consumption Accuracy of ±3℃ digital temperature sensor Specifications: Temperature range: - 40~85℃ Weight: 2g Package included: 4 x  RTC Clock Module( battery are included)