ARDUINO M525 RTC IIC I2C IIC DS3231SN Real Time Clock Module ChronoDot V2.0 Timer Counter and Clock Electronic Hobby Kit

Can provide for arduino libraries and routines Use DS3231SN precision clock chip, built 32.768 crystal Can provide precise year, month, day, hour, minute, second, in the morning and afternoon data You can output 1Hz signal, a second output signal