Three-Level HeatingFeatures 3 adjustable temperature settings: 60, 50, and 40, easily controlled with one button for comfortable use by both elderly and children. USB PoweredCompatible with 5V power banks and other USB devices for safe, low-voltage operation, making it perfect for outdoor use or travel. Quick HeatingWarmth spreads across the neck within 3 seconds of activation, promoting circulation and relaxation. Safety FeaturesEquipped with a 45-minute auto-shutoff and overheat protection for worry-free use, especially during nighttime wear. Comfortable MaterialMade from breathable, lightweight fabric that's elastic and washable, ensuring easy maintenance and comfort even during perspiration. Versatile DesignThe jacquard knit pattern adds a stylish touch, making it suitable for various occasions and complementing different outfits. Specifications: Material: Acrylic fiber Length: Approximately 95cm Temperature Settings: 3 levels (60, 50, 40) Power Source: USB (5V/2A recommended)