2 In 1 Portable Heating And Cooling Air Conditioner Wearable Neck Protector Electric Scarf Product 2 in 1 heating and cooling: the electric scarf with temperature control technology provides heating and cooling mode, which is very suitable for year-round use. The heating mode can adjust the temperature of the scarf between 38 and 52 , and the cooling mode can operate at 6 to 11 lower than the ambient temperature. Flexible size: the size around the neck can be adjusted by knob to meet various needs. The length range is 37-50cm / 14.54-19.65inch, and the width range is 12.5-18cm / 4.91-7.07inch, which is suitable for different people's ages and statures. Material: made of ABS shell and aluminum alloy radiator plate, it is light and durable, and has no burden on your neck. It can be folded into a small size and easily stored in a pocket or bag for easy use. Security design: using IC intelligent chip. When an over-current is generated, the power is automatically cut off and restarted to prevent failure. After the scarf cools, you can use it again. Battery: built in 10000mah battery, can work continuously for up to 3 hours. You can also plug in a USB port or a mobile power supply to extend the service time. specification: Product name: Neck-mounted cooling and heating device LT-F02 Material: Main body: ABS, cooling plate: aluminum alloy size: Min: width 125*height 40*inner width 80mm, maximum: width 180*height 40*inner width 145mm perimeter: The smallest: about 37cm, the largest: about 50cm Color box: 17*15*5cm Weight: 170g Power supply: USB/mobile power Power: 5V/2A Gear position: I weak gear/II strong gear Mode: cooling mode/heating mode Temperature: (cooling plate) Heating mode: 38-52 Cooling mode: 10-15 lower than the ambient temperature Use time: about 5 hours (5000mAh), about 10 hours (10000mAh), about 20 hours (20000mAh) Including: 1*neck-mounted air cooler and heater, 1*packing box