Application
Portable solar powered variable message sign is a kind of road guide vehicle, which is designed for road construction design. In the progress of road repairing, it is placed in the front of maintenance road and drivers will see the sign at a safe distance and they can decelerate timely to keep smooth traffic.

The usage of solar cell and holder
Firstly, you should open the solar cell holder and then keep the sun perpendicular incidence on the solar cell. Besides, the solar cell should be horizontal placed before transportation, which can reduce resistance and be convenient for transportation.

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