Tailored Sizing: Select the perfect size based on your body measurements. Please note, our products do not include a mobile power source. Intelligent Temperature Control: Experience intelligent temperature control with heating elements for knees, back, and waist. Achieve rapid heating in just 30 seconds, ensuring a prolonged and efficient heating duration. USB Compatibility: Equipped with a USB plug compatible with most portable chargers available. The 3-level temperature is adjustable, allowing you to set the desired warmth level. An indicator light helps monitor and adjust the temperature. Safety First: Designed with safety in mind, the heating underwear features a built-in thermal protection module. It operates on a safe voltage and includes overheating protection. If overheated, it temporarily stops working until the temperature returns to the standard level. Enhanced Blood Circulation: Utilize heating underwear to enhance blood circulation and boost metabolism. Ideal for a variety of outdoor activities such as skiing, fishing, jogging, hunting, cycling, mountain dog protection, running, snow removal, and more. Stay warm and comfortable during your favorite pursuits