Features: 1. Designed specifically for astronomical telescopes and compatible with DSLR camera lenses: protects optical equipment such as telescopes and cameras from fogging or freezing. Compatible with lenses with an outer diameter of 76mm or less; It can be used to heat milk bottles or to feed them indoors or outdoors. Can be used as a wristband or knee brace to protect you from the effects of cold weather or emergency situations. 2. Convenient USB port design; Connect it to a power source through a USB port, such as a 5V mobile power supply, car charger, etc. 3. 0.3meter 3speed regulator with medium weak heating mode. You can adjust the temperature according to different usage requirements. Ultra fast continuous heating, quick start heating. 4. A narrow width of 50mm will not interfere with focusing and will not produce dark angles in the field of view; The width also reduces the interference of other accessories on the mirror tube. 5. Good insulation effect: Imitating OK fabric, SBR, and Black-T three-layer insulation materials, it reduces heat dissipation and has no wrinkles on the inner surface after bending. It is more suitable for the lens barrel and increases the insulation effect. 6. Uniform heating: The builtin aluminum film heating surface is uniform and has no dead corners. Specifications: 1. Brand: SVBONY 2. Model: SV172 3. Dew heating strip size: 240 * 50mm 4. Dew heater strip length: 320mm 5. Interface type: USB Type-A 6. Input voltage: DV 5V 7. Input current: 1.45A? 9? 11.55A 8. Power: 7.25W-7.75W 9. Temperature adjustable: Yes 10. Power cord length: 1.8m 11. Dew heater strip material: imitation OK cloth+SBR+Black-T+aluminum film+PU 12. Material of power cord: Nylon 13. Net weight: 66g/