1. Size: 38mm (L) * 22mm (W) * 14mm (H) 2. Operating voltage :3.3 – 5 .5 V. 3. clock chip: high-precision clock chip DS3231.. 4. Clock Accuracy :0-40? range, the accuracy 2ppm, the error was about 1 minute. 5. calendar alarm clock with two. 6. chip temperature sensor comes with an accuracy of ? 3?. 7. memory chips: AT24C32 (storage capacity 32K). 8. IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V).
