It actually doesn't feel stronger than a TENS but it goes deeper re the stimulating than the TENS so it's more effective. I still can't think of the what it's called~ not the name but the type of product as it is a step up from a TENS.
Electrocution
yeah that's what the TENS felt like when I had it cranked up all the way trying to walk thru Target when I used it. It was a waste for me. I gave mine to a friend who found it useful. It works for some and not for others .. like most things spiney related