about this item:

HOT THERAPY FOR PAIN RELIEF: Built-in heat therapy pad can warm your lower back, abdomen and promote blood circulation. It can help relieve menstrual pain, sedentary lumbago. Applies to women, the elderly and also applies to office workers, long-distance drivers and others who are easy to suffer lumbar muscle strain, stiffness, arthritis. 1 BUTTON CONTROL 3 TEMPERATURE: 3 heat-settings to choose. Widely temperature range from 104-194℉, which can be changed easily by one button. When you use USB charging cord, the temp can be adjustable from 104℉ to 140℉. ADJUSTABLE BELLY SIZE: the waist heating pad can wrap around the waist and be locked at the targeted position where you need heat. Fits almost every waistline. The heated waist belt has a built-in mesh bag, you can also use it for cold therapy by putting an ice bag in if need be. COMFORT TO WEAR: Long power cable minimizes activities range limit. Breathable and lightweight neoprene eases discomfort. Temperature regulating provides warmth yet still allowing air to circulate. Great for use when you're watching TV or reading a book on the sofa at home, working in front of the computer, or even during your travel.