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The twilight switch is used to automatically turn on the lighting of streets, squares, exhibitions, advertisements, etc. at dusk and turn off the lighting at dawn. When checking the operation of the machine, cover the whole machine tightly, e.g. with a cardboard box or a dark, thick cloth. Covering only the "eye" probe, e.g. with a finger, is insufficient, because the intensity of sunlight is very strong and penetrates the photoelement through the plastic housing and the human body.