This is thanks to the fact that the U-GYM Mini uses medium frequencies for its massages, unlike other TENS devices that operate below 1kHz. Also because it is so small and easy to use, you could wear it under your clothes and no one would be the wiser. You could even get a massage while at work and your co-workers probably wouldn’t even know. If you think this is something you’d like to get your hands on, then head on over to its Indiegogo page for the details.