I have just returned this product.  The switch was working well until, after less than a month of use, it quit.  I took the unit apart and found that a tiny - REALLY TINY - white piece of plastic was what connected the top of the foot switch to the electrical device.  It was the trigger that make the switch go on and off.  That pice of plastic had broke.  IF they had made the switch with a metal piece instead of plastic the thing might have lasted a lifetime.  This will forever be a mystery to me.  Why would a designer make a critical part that will take stress both small and plastic?  Why not increase the diameter of the part (in this case very easy to do) and make it out of something that will last?  The plastic part was about 1/16 of an inch square, maybe less.  Why?  A 1/4 inch piece of good plastic would probably last 10 years.  A 1/4 inch piece of quality metal would last forever.  What would that cost?  Maybe another dollar or two max?  Incredible.