High Accuracy DS3231 I2C RTC Module w/ AT24C02 EEPROM for Arduino

Based on DS3231, this is high-precision real-time clock module. DS3231 can not only do the timing, set two alarms and it can also measure temperature. Onboard AT24C02 EEPROM, you can record more alarms and events information. Onboard CR1220 battery holder, it is convenient to keep timing when main power to the device is interrupted.
Features:
- Compatibility: Compatible with Arduino UNO R3 / Arduino Mega2560
- Working voltage: 3.0 ~ 5.5VDC
- Working current: 3mA (Max)
- Interface: standard I2C interface (400kHz)
- Timing accuracy: ±2ppm @ 0~+40'C; ±3.5ppm @ -40~+85'C
- Temperature measurement accuracy: ±3'C
- Temperature resolution: 0.25'C
- SQW is programmable square wave output pin
- Arduino Library: DS3231
- Great for Arduino DIY project