3 temperature modes and 4 massage modes: This USB heated scarf requires an additional 5V or 5000mAh lightweight battery pack to connect and can last up to 9 hours of continuous use. We can also connect the USB to a computer and car charger to warm it up. With the temperature controller, we can set 3 different temperature levels. We can set the temperature to a comfortable level depending on indoor and outdoor weather conditions. SAFE and FAST HEATING: The heated scarf is made of safe and durable carbon fibre heating elements that heat up quickly and conduct heat well. The heating surface covers the entire neck area and keeps your neck warm in the cold winter. LIGHTWEIGHT AND COMFORTABLE: This warm scarf heating pad is lightweight and fits snugly around your neck, keeping you cosy and warm when you're out and about in winter. This warm scarf is made from carbon fibre to keep you warm with ease. The heated scarf also improves blood circulation and helps to relieve muscle pain. WATERPROOF SOFT MATERIAL: The waterproof and windproof fabric surface ensures that the heated scarf stays dry even in light rain or snow. The waterproof, smooth surface resists stains and is easy to clean. The soft and breathable fleece lining provides maximum comfort for the neck. EASY TO USE: The heated scarf comes with a USB cable (without batteries) that you can conveniently connect to your computer, mobile phone, car, etc. and charge at any time. Simply press the power button for 3 seconds to switch on the scarf and press briefly to switch between the 3 temperature modes, very easy and convenient. This heated scarf is suitable for a variety of indoor and outdoor winter activities, such as skiing, fishing, cycling, camping, walking, driving and hiking.