Feature:

red color LED

Dimension: Length: 50mm,Width: 19mm,Thickness: 14mm
Operating voltage:3V~5V(Note:the voltage is lower , lower brightness, lower power consumption) 
Four display modes: 
1 only display time 
2 only display the date 
3 only display temperature 
4 display the time, date, temperature alternately 
With temperature display function,display range:-9~60°C ,Withtemperature error correction,Range is -5 °C to 5 °C
With 24h timing error correction,Range is -9 to 9 seconds.(Note:To make the function take effect,required 24 hours of continuous power supply, that is,working 24 hours before correcting the erroronce) 
The DS1302 chip timing comes with a back up CR1220 battery,power-down time to continue to walk 
Crystal Accuracy: 5ppm