Wanted to add my 2 cents here.

Long time user of the tens 7000. My set up is using rubber loops threaded with copper wire on a single channel. I put one at the base of the penis, and the other right up against the back of the glans, tucked nicely on the corona. (Works excellent for smaller guys...5 in").

My go to settings start at rate of 35 and width of 70 on constant. I gradually increase the intensity dial all the way up to 8. The back off and increase the width by 20-30. Then back up. Then I'll back off again and increase width to 120. At 120 width I start using modulation, sd1, sd2, slowly increasing up to 8 again. Rinse and repeat, rinse and repeat. Somewhere along the way I'll decide to get the rate up to about 75.

I can confidently say this practice has brought me to HFO over and over again, and stronggg HFOs at that. To this day I cannot get to rate of 150 and width of 300 at intensity level 8 without blasting cum. I can sometimes withstand the sensations that the maximum levels provide but within seconds I explode.

Looking for ways to use to incorporate the second channel and maybe even additional loops but for now I'm still experimenting. Thinking about maybe plugging both blacks into the same loop and both reds. Not sure if it will work.

Anyway, wanted to share and open to suggestions. I'm sure the really expensive boxes have their pros. But nonetheless, the tens 7000 for like $35 can most definitely get you there.