fog and condensation with our specially crafted lens warmer for clear photography in cold weather. Perfect for outdoor enthusiasts and professional photographers. Our lens defogger is powered by USB, making it convenient to use with a power adapter. It provides 3 temperature levels for different weather conditions. Designed for lenses and telescopes, our lens defogger is a must have for photographers and astronomers who want clear images in any weather. Not only does our lens defogger keep your camera lens clear, but it can also be used to warm baby bottles and provide warmth to your wrist, elbow, and ankle. Suitable for indoor and outdoor use. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.