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 small essentials. Designed for easy folding and convenient storage. 3. Equipped with a hidden switch button. Press and hold for three seconds to turn on; initial setting is low heat. Click to cycle through temperature levels: blue indicates low, green indicates medium, and red indicates high temperature. 4. Using a 3500 mAh power bank as reference, low temperature reaches approximately 42°C, medium temperature around 48°C, and high temperature up to 55°C. Automatically shuts off after 2.5 hours of use and can be reactivated when needed. 5. Crafted with fine workmanship and neat stitching, this scarf is ideal 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 between the color shown in the image and the actual item. Measurement allows an error of +/- 1-3 cm.