There is not an on/off switch. You literally have to hold down a switch button for it to heat it up in order to make it work. By the time its warmed your hand is sore. As soon as you let it go it shuts off and cools down quickly. Product description did not mention this and said there is heating controls on it. When I tried to return it, It says it’s non returnable !!! ( my box was damaged and taped so maybe it was a returned item)