Men's heated underwear set, 22 heating zones, intelligent temperature control, 10 seconds rapid heating, 5V safe voltage, 8+ hours of battery life, water-resistant. Features: 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. 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. 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. 5V Safe Voltage: Only heat conduction, no electricity conduction, safer to use. 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. Specifications: Material: Knit surface: 95% cotton, 5% spandex, Lining: 95% polyester, 5% spandex Color: Black Input voltage: 5V Power: 7.5W Size: L-4XL Optional Weight: 1028g/36.26oz - 1182g/41.69oz Package list: 1*Heated underwear top 1*Heated underwear pants