SODIAL Tiny DS3231 AT24C32 I2C Module Precision Real Time Clock Module For Arduino 1.DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal; 2.The device incorporates a battery input, disconnect the main power supply and maintains accurate timekeeping; 3.Integrated oscillator improve long-term accuracy of the device and reduces the number of components of the production line; 4.The DS3231 is available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package;RTC maintains seconds, minutes, hours, day, date, month, and year information; 5. Size: 38mm (length) * 22mm (W) * 14mm (height); Weight: 8g;