Estink High Precision RTC Clock Real Time Module Memory Module for Raspberry Pi with Battery 4 Pcs Set DS3231

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 systemComplete 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 outputRTC Clock Module has the characteristic of low power consumption Accuracy of ±3? digital temperature sensor Specifications: Model: DS3231 Temperature range: - 40~85? Weight: 2g Package included: 4 x  RTC Clock Module( battery are included)