Hello Gerald. Each switch has a function. the the test-1-5-10 allows you to set it to test or an on period of 1 or 5 or 10 minutes. The off-3-6-dusk to dawn allows you to turn it off completely, operate from dusk for 3 hours, operate from dusk for 6 hours or operate from dusk to dawn. By operate I mean turn on and then stay on for the number of minutes you set it to with the other switch.
what's nice about the test setting is that with it allows you to check and b sure that the light will come on during daylight by setting the one switch to test and the otner to any setting but off.
If you leave the 2nd switch set to off the first switch will not allow you to test it.
Joe
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