1.【Real Time Clock Chip】：The DS3231 AT24C32 is used as a real time clock chip which keeps the time running even if the main power supply is off (with the help of a battery). 2.【Complete Clock Calendar】：Functionality Including Seconds, Minutes, Hours, Day, Date, Month, and Year, with Leap-Year Compensation Up to Year 2100. 3.【Extremely Accurate】：DS3231 memory chips - AT24C32 ,extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. 4.【Two programm】：Provides programmable time-of day alarms and a calendar can be set to a square wave output. Address and data are transferred serially through an I2C bidirectional bus. 5.【Safe Enough】：A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, provide a reset output. In addition, RST pin is monitored as generating a μP reset.