I turned it on before listing it, and it works normally. I used it once and then forgot about it. The INKO Heating Mat is an innovative USB slim heater that uses silver nano ink as a heating material. It is made of a soft material that is 1mm thick, and can be rolled up for easy storage. It's easy to carry around in the office or when you're out and about, and it's a safe, secure, and warm innovative heating gadget. There is no box or instruction manual.