【Three-Level Intelligent Temperature Control】This hand warmer features three adjustable heat settings with digital display, allowing you to maintain a constant and comfortable temperature for long-lasting warmth 【Far Infrared Heat Therapy】Utilizes far infrared heat technology to promote blood circulation and nourish deeper muscle layers, offering soothing relief and enhanced comfort 【Dual-Sided Heating Design】With double-sided heating, it maximizes the surface area exposed to heat, delivering a more effective and uniform warmth for hands and knees 【Waterproof Down Cotton Material】Crafted from waterproof down cotton fabric, it provides a soft, skin-friendly feel while retaining superior warmth, perfect for cold weather comfort 【Four Safety Protections】Built with multiple safety features, including protection against overcharging and electrical leakage, ensuring safe and reliable use without water-related risks Specifications: Material: down cotton fabric Heating method: technological constant temperature heating sheet Input: 5V-2A Rated power: 5W Gear: 3 gears of heating Product size: 26 x 27 x 5cm Product net weight: 80 grams