Parameters:
1. Size: 38x22x14mm/1.49x0.86x0.55in(LxWxH)
2. Weight: 8g
3. Operating voltage :3.3 - 5 .5 V
4. Clock chip: high-precision clock chip DS3231
5. Clock Accuracy :0-40 ¡æ range, the accuracy 2ppm, the error was about 1 minute
6. Calendar alarm clock with two
7. Programmable square-wave output
8. Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation
9. Chip temperature sensor comes with an accuracy of ±3°C
10. Memory chips: AT24C32 (storage capacity 32K)
11. IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)
12. Can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57

Features:
1.RTC saves seconds, minutes, hours, day of the week, date, month and year information. For months with fewer than 31 days, the date at the end of the month is automatically adjusted, including corrections for leap years. The working format of the clock can be 24 hour or 12 hour format with /AM/PM indication. Provides two programmable calendar alarms and a programmable square wave output. Address and data are transferred serially through the I2C bidirectional bus.
2.In addition to high timing accuracy, the DS3231 also has some other features that expand the additional functions and options of the system host. A very digital temperature sensor is integrated inside the device, which can be accessed (like time) via the I2C* interface.

Package includes:
2 x DS3231 I2C Module(This kit does not include batteries)
1 x 12pin Female to Male Cable