1. The heating scarf is made of fleece fabric with a heating sheet in the middle. The USB connector can be linked to a power bank (not included) for charging. 2. Features an internal zipper pocket for storing a power bank, convenient for use and easy to fold for storage. 3. Equipped with a hidden switch button; long press for three seconds to turn on. Initial setting is low heat. Click to cycle through heat levels: blue indicates low temperature, green indicates medium temperature, and red indicates high temperature. 4. Using a 3500 mAh power bank as an example, low temperature reaches approximately 42°C, medium temperature approximately 48°C, and high temperature approximately 55°C. Automatically turns off after 2.5 hours of use and can be reactivated when needed. 5. Well-crafted with neat stitching, 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 x Heated Scarf Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement allowance is +/- 1-3 cm.