After 3 uses, while using, the battery got extremely hot!! The belt really never got warm enough to provide any comfort. The battery is in a pouch inside the belt, so it presses against your side. Very uncomfortable! Now the battery won't charge!! Absolutely do not buy this junk!!!!!

It warms slow which is the reason for the 4 stars. I like that is rechargeable I can use it while I run outside (Lower back pain with each step) heat helps keep the muscles lose. I recommend it.

This heating pad comes in handy when you are out and about. I can go on with my day and get relief from the heating pad. The heating pad gives off a descent amount of heat. I wish it would still get hotter though. But it does do the job at least making my day a little bit better. It charges fairly quickly. I usually can use it for at least 2 hours straight.