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Two time-of-day alarms Operation voltage: 3.3-5.5V Fast (400kHz) I2C Interface Memory chips: AT24C32 (storage capacity 32K) Application: Servers/Telematics/Utility Power Meters/GPS DS3231 AT24C32 Clock Module Real Time Clock Module IIC RTC Module for Ard-uino . Calendar alarm clock with two programmable square-wave output . Generating seconds, minutes, hours, day, month and year information. Wiring instructions (with Ardu&ino uno r-3 for example): SCL→A5 SDA→A4 VCC→5V GND→GND Package included: 2 X DS3231 AT24C32 IIC Module 20 X Female to Male Cable