Mine is wired. Each lead splits into 2 wires, giving me 4 pads. The only wireless I've seen are those at the drugstore, found in the thermacare products, adhesive patches. I doubt they are nearly strong enough. But if you find one that's really good let us know. 🙏🌼
My TENS Unit also has wires. I have tried the Smart Relief wireless one. It only has one setting for the pulses and doesn't seem to durable. Mine quit working after a few uses then I changed the battery and it still doesn't work. I called the company and asked about their guarantee and that's another mess. I have my TENS Unit issued by my doctor and it's more reliable. There are 2 wire feeds but you can use only 1 wire feed if you want. The battery is rechargeable. The pads are easy to clean, just run them under cold water for a few seconds and let air dry. The pulses are variable whether you want constant or a variety of pulses and the charge going through the wires is set to your own personal preference. I did not like Smart Relief and find that my current TENS (with wires) is more reliable
I just got one off ebay that has wires. It is small and i wear it when I have errands. It has mutiple pulse types and now that i have figured out which one is best for me it does help to a certain degree. For me the certain degree is when I try to do stuff I am not suppose to which seems like everything.
I ordered mine on line at medical products.Com it has wires but it is a dual tens / e-stim unit. It is about the size of a pack of cigarettes. Most of the places online say they require a doctors prescription but they really just want to sell a product. Honestly I do not use the e-stim, it hurts. I paid about $50.00 and I have no complaunts. There is a learning curve to exactly where to place it and how to set the settings. If you have had any physical therapy maybe they can assist you with settings. I think there are enough of us here to guide you with placement. Also if you put the electrodes back on their plastic film and seal them they will last a very long time. I have used one set for the better part of a year, a few times a day. I would just start my search on Amazon or Google. Hope this helps you.
Mine is the tens 7000 on ebay I think I paid 25 including shipping for case, machine, lead wires and 4 pads. About the size of a thick deck of cards and has a belt clip. My pain is my spine and I just put one on each side and out a couple inches from my spine where it hurts most. Pretty easy to use