Quote Originally Posted by Sgt_Strider
What do you mean by Polarity and how does that have to do with the Power and Reset switch?
LED had positive and negative pole. only light when voltage is applied in the positive pole....so if reverse then no light because it is actually a diode...where current flow on single way only.......

power and reset sw are just basically contacts only....when depress the contact are just close to send a trigger signal only....

i had always use a screwdriver just to on the com. this way....

as for the led, just had to know which is positive or negative will do or just flip around when it doesn't