The DS3231 RTC module is a low-cost real-time clock that is commonly used with microcontrollers to keep track of real-world Date and Time. The module consists of two important ICs namely DS3231 and AT24C32 IC with a crystal oscillator, and a temperature sensor. The Time, Date and Temperature value from the module can be sent to a microcontroller like Arduino via I2C communication. This RTC Module with also available with battery.