Hi, happy to answer any questions you might have. I have a tens unit that accommodates four pads on two separate channels so yes, you can use them in multiple locations at the same time and when I apply them in the right positions and adjust the intensity levels to what’s tolerable, I find I get instant relief, particularly in my back. Yes, you can travel with it and conceal the wires and the controlling unit in your clothing. On occasion I’ve even slept with it on all night. Hope you find this information useful and are able to find the same level of relief that I did. You just have to experiment a bit. I do keep an extra supply of pads and batteries on hand because I use it a lot.
Good luck.