Prevent lens condensation in colder climates down to -40°F using the Haida V2 Anti-Fog Belt, an ideal tool for landscape and wildlife photographers. Low, medium, and high power settings can be adjusted using the integrated controller. It accommodates lenses up to 4.3" in diamter. Use the simple hook-and-loop fastener to secure the belt around your favorite camera lens or telecsope. Power this device by USB or USB-C connection using convenient sources like a camera battery, power bank, or a car auxiliary power outlet. This device is CE/FCC/RoHS certified.