This USB lens heater is made of high-quality composite fiber heating wire and adhesive material. With 3-mode temperature control (low, medium, and high), it can defrost and warm your camera lens and other items in different situations. The USB port design makes it easy to use anywhere, and the lightweight and portable design makes it ideal for both indoor and outdoor use. The anti-fog and heating strip also protect your wrist strap and knee from cold weather. Featrues 1. Lens heating: Protects the lens of your camera or telescope before freezing and fogging. Perfect for taking pictures overnight or morning in somewhere with high humidity. 2. Material: High quality, made of premium material. Fit the most common devices. 3. Temperature adjustable: This product is equipped with an 150cm temperature regulator, with low(35-45), medium(45-55) and high(55-65) modes, which you can adjust the temperature according to different needs. 4. Multi-use: Great for lens heating, warming up water bottle and feeding bottle, and also can be use as a special wrist strap/knee to protect them from cold weather. 5. USB port design: It is very handy to use because you can connect it either to your power bank or any other power source with a USB port. Specification Material: Composite Fiber Heating Wire, Adhesive Material Color: Black Size: 386.5 cm, USB Cable 1.5m Weight: 80g Package Include: 1 Lens Heater Warmer 1 USB Cable