RTC Real-time Clock Board DS3231SN ChronoDot V2.0 I2C for Arduino Memory DS3231 Module

Feature Use DS3231SN high precision clock chip built in 32 768 crystal oscillatorCan provide accurate year month day hour minute second morning and afternoon dataCan output 1Hz signal one signal per secondYou can use CR1220 button battery to keep running timeI2C bus pull up resistor welding R1 R2 by yourselfSmall size 3cm in diameterPin spacing 22 86mmWithout batteryPackage includes 1 x RTC Real time Clock Board