Feature:1. Black Technology Warmth: Using advanced heating technology, 22 areas of the body are heated, fully upgraded, allowing you to feel warm in the cold winter.2. Intelligent Temperature Control System: 25~55°C adjustable temperature, 3 levels of temperature control, one-button temperature control, allowing you to adjust the temperature according to your needs.3. 10 Seconds Rapid Heating: Using efficient heating materials, it can be heated in 10 seconds, allowing you to quickly feel warm in the cold winter.4. 5V Safe Voltage: Only heat conduction, no electricity conduction, safer to use.5. 8+ Hours of Long-lasting Battery Life: Built-in large-capacity battery, a single charge can be used for more than 8 hours, allowing you to keep warm for a long time when you are out.Specification:Specifications: Material: Knit surface: 95% cotton, 5% spandex, Lining: 95% polyester, 5% spandex Color: Black Input voltage: 5VPower: 7.5WSize: XLWeight: 965g/34oz - 1100g/38.80oz.Package List:1 * Heated underwear top1 * Heated underwear pants