I got 2 of them five hours before flying east. Before flying, I applied the module to my lower back in the bathroom. man! ! ! Does this make the world different. When I got off the plane, my back didn't hurt anymore. I gave the second one to my daughter-in-law<She has a new baby, and she wears it almost all the time, always using it on her mid back. This is a good purchase. If you use it consistently, you will be surprised to find that you feel better, so I would recommend this EMS machine to you.
