1. The heating scarf is made of fleece fabric, with a heating sheet in the middle, and the USB connector can be linked to a power bank (not included) for charging. 2. There is a zipper pocket inside the heated scarf for storing a power bank, convenient to use and can be folded for storage. 3. Hidden switch button with key switch/adjustment design; long press for three seconds to turn on, initial setting is low heat, click to change levels: blue indicates low temperature, green indicates medium temperature, red indicates high temperature. 4. Using a 3500 mAh power bank as an example, low temperature is approximately 42°C, medium temperature is approximately 48°C, and high temperature is approximately 55°C. The scarf automatically turns off after 2.5 hours of use and can be reactivated when needed. 5. The scarf is finely crafted with neat ing, suitable for outdoor activities such as cycling, skiing, snowboarding, skating, mountaineering, climbing, and hiking. Weight: 0.09 kg Color: Black Material: 100% fleece Size: 26 x 14 cm Package Contents: 1 * Heated Scarf Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3 cm.