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Twilight switch, contents include surface-mounted brightness sensor. The turnus 502 A has an adjustable switch-on and switch-off delay of 0 to 100 seconds. Up to 10 devices (20 channels) of the types turnus 502, 771 plus and 772 plus can be expanded to form a single light control system with just one brightness sensor. The turnus 502 A is sealable.
