Size :38mm(length)*22mm(width)*14mm(height)2. Weight: 8 g3. Working voltage: 3.3-5.5v4. Clock chip: high precision clock chip DS32315. The clock precision: 0-40 range, precision 2 PPM, in error about 1 minuteBring 2 calendar alarm clocks7. Programmable square wave output8. Real-time clocks generate seconds, minutes, hours, weeks, dates, months and years, and provide intercalary year compensation up to the year 21009. The chip itself temperature sensor, the accuracy of plus or minus 3 10. Memory chip :AT24C32(storage capacity is 32K)11.IIC bus interface, with maximum transmission speed of 400KHz(when working voltage is 5V)12. Other IIC devices can be cascaded. The 24C32 address can be modified by short circuit A0/A1/A2, and the default address is 0x5713. The battery CR2032 ensures that the clock will still move normally when the system is powered down14. Packing method: single anti-static packingWiring instructions (take Arduino uno r3 as an example):SCL - A5The SDA - A4The VCC - 5 vGND to GND Mainly Compatible with: Arduino Batteries Included: No 0.0110 Package weight: 0.034 kg Product Size(L x W x H): 3.80 x 2.20 x 1.40 cm / 1.5 x 0.87 x 0.55 inches Package Size(L x W x H): 8.00 x 8.00 x 1.00 cm / 3.15 x 3.15 x 0.39 inches