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How to choose a solar warning light?

1.Choose the flash style,flash in turn or flash staedy
2.Choose the size of the warning light
3.Choose the fix mode of the solar warning light
4.Choose the color the solar warning light
5.Choose the visual distance in darkness of the solar warning light,over 400meters for examples
6.Ensure the continue working time without solar power,over 200hours for examples
7.Choose the reflective tap's quality