Module Parameters: Size: 38mm (length) x 22mm (W) x 14mm (height) Weight: 8g Operating Voltage: 3.3v – 5.5v Clock Chip: high-precision clock chip DS3230. Clock Accuracy: 0-40 range an accuracy of 2ppm, around 1 minute per year. Calendar Alarm Clock: with two alarms. Programmable: Square-wave output. Real Time Clock Generator Producing: seconds, minutes, hours, day, date, month and year timing, providing valid leap year compensation until 2100. Chip temperature sensor comes with: Accuracy of 3 Memory Chips: AT24C32 (storage capacity 32K) I2C / IIC bus interface: the maximum transmission speed of 400KHz (working voltage of 5V) Can be Cascaded with: other IIC devices, 24C32 addresses can be modified by shorting A0/A1/A2, default address is 0x57 Accepts: CR2032 or LiR2032 to ensure time keeping after power failure. Packing: Single anti-static packaging Wiring instructions (with Arduino UNO R3 for example) : SCL A5 SDA A4 VCC 5V GND GND What you will receive: 1 x DS3230 AT24C32 I2C Precision Real Time Clock & Memory Module for Arduino