led solar cell flashing warning yellow light for safety front school building |
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| navigate by keyword : background beacon black building caution cell city closeup concept control copy electric electrical electricity energy equipment flashing front illumination led light modern net orange outdoor panel pedestrian pole post power protection road safety school secure security sign signal solar space street sustainability symbol system technology traffic transportation urban warning yellow zero |
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| LED solar cell flashing warning yellow light for safety in front of school building. |
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