Astromania Dew Heater for Telescope DSLR Camera Lens, 300mm DC Lens Heater Warmer Stepless Temperature Regulator for Universal Cameras and Telescopes Lens Less Than 3.75 inch (95mm) in Outer Diameter

Stepless Temperature Regulation: This product is equipped with a stepless temperature regulation controller; by sliding the knob on the controller; you can adjust the temperature according to different needs. DC Lens Warmer: Protects the lens of your digital camera or finder scope from freezing by chilling fog and dew; enabling the devices to function properly at night when the temperature drops or places with bad weather. Widely Applicable: Can be adjusted and used according to the lens size; and is suitable for most telescopes; cameras; and other lenses with an outer diameter of less than 95mm ""3.75 inches"". DC 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 DC port; Specific Dimensions of DC Female Port: Outside Diameter: 5.5mm and Inside Diameter: 2.1mm. Quick Use and Removal: which not only allows the defogging belt to fit your lens; but also allows you to quickly disassemble and adjust the length you need