RTC I2C module – DS3231 AT24C32 IIC Precision RTC Real Time Clock Memory Module – without battery

Battery not included. It is an extremely accurate i2c real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, disconnect the main power supply and maintains accurate.

• Operating voltage :3.3 – 5 .5 v
• Clock chip: high-precision clock chip ds3231
• Clock accuracy:0-40 centigrade range, the accuracy 2ppm, the error was about 1 minute
• Calendar alarm clock with two
• Programmable square-wave output