Adjustable Waist Design Easier to fit more body shapes, and also convenient for you to wear underwear clothes of different thicknesses. Collar Design Warmer, and effectively protect the neck from being scratched by the edge of the zipper. Battery Pack Included Equipped with a UL certified battery, and built-in exclusive battery pocket, which is convenient for gift recipients. Easy to Use Long press for three seconds to turn on/off, short press to switch gears Multi-Heating Zones The heated vest can effectively provide warmth to your core body part Three Temperature Levels Red-high, White-medium, Blue-low. You can adjust the temperature of the three gears according to the environment and your needs. Washable Hand washable/machine washable (in the laundry bag). TIPS: Please remember to take out the battery and zip up the pocket before cleaning. Air-dry. Packaging Handbag The heated vest kit comes with a portable, waterproof and reusable packaging handbag.