Quite a surprise!
I thought that, for the price, I would get just a little bit of heat to help fend off cold hands. I wore a nice pair of Thinsulate Winter gloves, and had some liners & heat paks in my pocket, for a little help if needed. As the temperature dropped, I could feel my hands getting cold. then I remembered my new heated grips! I turned on the heat! It took just a couple of minutes for me to feel serious heat being added!