SVBONY SV192 Lens Defogging Strip 560mm Heating Strip Three Levels Temperature Adjustable 1. Connector type: 5.5 x 2.1 2. Input voltage: 12V 3. Input current: 1.7A 4. Power: 19.2W-21.6W 5. Temperature: 3-speed adjustable 6. Material: Imitation OK Cloth + SBR + Black-T + Aluminum Film + Cotton 7. Material of power cord: TPE silicone 8. Net weight: about 72g 9. Power cord length: about 1m 10. Heater band size: about 56 x 5cm 11. Heater length: about 72cm Features: 1. Protects optical equipment such as telescopes from fogging or icing and is compatible with astronomical primes or camera lenses with an OD of less than 178mm 2. 5.5 x 2.1 female connector designed for easy connection to a variety of 12V power inputs 3. 3-speed regulator with medium and weak heating modes, can adjust the temperature according to different usage requirements, fast continuous heating, fast start heating 4. 50mm narrow width will not interfere with focusing, will not produce vignetting phenomenon in the field of view;, the width also reduces the interference of other accessories on the lens tube 5. Good insulation effect, imitation OK cloth, SBR and Black-T three-layer insulation material, reduce heat dissipation, no wrinkles on the inner surface after bending, better fit for the lens barrel, increase the warmth effect 6. Built-in aluminum membrane heating surface uniformity, no dead ends 7. TPE silicone power cord is not easy to harden at low temperature 8. Safe to use, prevent short circuit, alloy fiber heating wire can provide super fast continuous heating, silicone insulation process can prevent internal short circuit