I received this as a gift, so I don't know how often it was used. I opened one gel and used it once, but I didn't understand how to use it well and stored it without using it much. It's a used item, and there's no box, but it's clean. Operation has been confirmed. *There are also 6 boxes of unopened gel, which I am selling separately. Please comment if you would like to purchase them together. → Sold.