0.30" Digital Clock DC 12V 24V Green LED

Specifications:

Led size : 30mm ×14mm×17.5mm
PCB SIZE : 35mm×16mm×17.5mm
Power voltage: DC 7v-30V
Time mode: 24 Hours
Display Color: green 
Display: four 0.30" LED digital tube
Refresh rate: about 300ms
Time setting: single button to a sliding scale
Power off: keep time working 2 years (LED do not light)
Accuracy: 10ppm
Overload: four times the range
Operating temperature: -40°c - 85°c