As you can see from the reviews below – I have had a wristband since June of last year. I had a band with 2 units. It helped the nerve damage in in toes so much! I loved it. However I got to wondering what if I went to 4 units. I received it in the mail today. I have had it on 10 minutes and not only is does my toes feel normal – it has already started improving the neuropathy in my fingers as well. And this is just in 10 minutes! I expect wonderful results. I plan to order a spare wristband to pack in my suitcase. I have no desire to do any length of time without one of these on. They give me the ability to live a normal life. thanks for the product. I no there are a lot of folks who doubt they work. All I can say is I think they are the most wonderful thing I have found.