Holdding DS3231 AT24C32 IIC Module Precision Real Time Clock Memory Module Arduino/Precise Time Clock Module with a Temperature-compensated Crystal Oscillator[Product Information]- Operating voltage: 3.3 - 5.5V
- Clock chip: high-precision clock chip DS3231
- Memory chips: AT24C32 (storage capacity 32K)
- Clock Accuracy: within 0-40 C range， the accuracy 2ppm， the error was about 1 minute per year.
