I bought these when I bought the Quell device so I would be stocked up on electrodes. It claims that you use one up to 2 weeks, but I did good to get 3 - 4 days use out of one. I do have a larger leg, but the band stretches with Velcro attachment, however when I am walking, the electrodes start to slide down my leg and the gel starts rolling off the electrodes in certain places. It suggests that you make sure you leg does not have lotion or any other oil on it, so I did that, but it still slides down my leg. I already felt they were expensive for something you have to buy over and over, but I am really disappointed knowing that I can only get a few days use out of one electrode. I tried tightening the band only to rub a blister on my leg and have to stop use or change legs to give it time to heal. I hope the company can make some improvements and lower the MSRP.