The product description “DROK Timer Relay, Time delay DC 5V 12V 24V delay controlled board delay-off cycle time . . . . . . ”

I wish to use this timer delay relay and power it with a 12 VDC power supply only.

Q1) Can it be programmed on the bench then powered down and installed without losing the programming?

Q2) Because it will be operating on a single power supply, do I connect my control trigger switch across 12+  to ‘HIGH LEVEL TRIGGER’, or do I change my trigger to across ‘SIGNAL GROUND TO LOW LEVEL TRIGGER’ ?

Q3) No additional power sources will be required for this to function (stand-by or operational) 24/7 ?
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