? 【3 Seconds Fast Heating Pad】Our menstrual heating waist belt has a built-in PI metal heating film. Once the device is powered on, it will release far-infrared waves to heat up. It will heat up quickly in 3-6 seconds and effectively drive away the cold and relieve women's menstrual pain and cramps.【Beware of Burns! Please use it with clothes on. Don't straightly touch the skin.】