I purchased the offending unit a few years back. It worked for about a year but like everyone else the results were not permanent.
Then the red light began to come on after 3-4 rolls across my skin. I don't have patience for things that don't work as they are supposed to so I put it away in the back of a drawer (not wanting to toss the useless piece as I paid $$$$$$$). Today I found it and decides to investigate this piece my own. Out came the butter knife, the steak knife and tweezers (which are always at hand because the NO NO doesn't!) I pried open the housing and discovered a wire was broken.
I got some blue electrical tape, stripped the wire and viola! It worked...for 5 swipes across my skin.
I'm going back to purchase new thermo thingamajiggers (with the guarantee the store will refund my purchase if it doesn't work). Hopefully it will work (I'm not holding my breath...I'll get light headed and faint!)
Reason of review: Damaged or defective.