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 interior 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 temperature 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 around 48°C, and high temperature up to 55°C. Automatically turns off after 2.5 hours of use and can be reactivated when needed. 5. 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 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 allows an error of +/- 1-3 cm.