It's a DS3231 Real Time Clock Module. This is a RTC based module. DS3231 RTC is a Precise Real-Time Clock Module with 32Kbit EEPROM and a built-in 10-bit temperature sensor having a resolution of 0.25C. The DS3231 RTC module Precise Real-Time Clock Module is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input and maintains accurate timekeeping when the main power to the device is interrupted.
Features
Voltage Supply | 2.2 V ~ 5.5 V |
Active Supply Current (VCC = 3.63V/VCC = 5.5V) | 200/300 µA |
Color | Blue |