["RTC DS3231 AT24C32 Memory Real Time Clock IIC Module for Arduino AVR UNO ARM The DS3231 module is an accurate IIC real time clock (RTC), with integrated temperature", "Crystal oscillator (TCXO) and crystal. Queries: seconds, minutes, hours, day, date, month and year. Date is automatically adjusted, including corrections for leap years. The clock operates in either the 24 hour or AM/PM mode 12 hour format. The module offers two configurable “alarm clocks” and a calendar. The square wave output is programmable. Address and data are sent serially via an IIC or I2C", "Transmitted bidirectionally via bus. A precision temperature compensated reference voltage and a comparator", "Circuit monitors the status of the VCC to quickly detect a power failure. The IC has an integrated very accurate digital temperature sensor using i2C", "Interface can be queried. The module has a battery. Technical data:", "Operating voltage: 3.3 to 5.5 V", "RTC chip DS3231", "Accuracy of the clock 0-40? , 2ppm", "Calendar with 2 \"alarm clocks\"", "Programmable square wave signal output", "Eeprom: AT24C32 (memory capacity 32K)", "Bus interface, maximum transmission speed of 400 kHz (at VCC 5V)", "can be cascaded with other i2C modules", "Battery CR2032, in the event of a power failure the RTC continues to run stand-alone", "Module L x W x H approx.: 38 x 22 x 15mm (length with pin header approx. 44mm)", "Weight approx. 8g Scope of delivery:", "1 piece DS3231 module ready for operation (without button cell 2032)"]