XOTD 2 Pack DS3231 AT24C32 IIC RTC Module Clock Timer Memory Module Beats Replace DS1307 I2C RTC Board Compatible with Arduino Batteries not Included

Specifications: 1. Dimension: 38mm* 22mm * 14mm 2. Weight: 8g 3. Working voltage: 3.3--5.5V 4. Clock chip: High-precision clock chip DS3231 5. Clock accuracy: 0-40 ?, 2ppm accuracy, annual error is about 1 minute 6. With 2 calendar alarm clocks 7. Programmable square wave output 8. Real-time clock, it can generate seconds, minutes, hours, day, date, month and year, and provide time until 2100, and with leap year compensation. 9. The chip comes with a temperature sensor with an accuracy of ±3 ? 10. Memory chip: AT24C32 (storage capacity 32K) 11. IIC bus interface, the maximum transmission speed is 400KHz (when the working voltage is 5V) 12. Can be cascaded with other IIC devices. The 24C32 address can be modified by shorting A0 / A1 / A2. The default address is 0x57. 13. With battery CR2032, to ensure that the clock still moves normally after the system is powered off. Package Included: 2 x DS3231 AT24C32 IIC RTC Real Time Clock Module