Astromania 25 cm DC Lens Heater Warmer Dew Heater Strip - Stepless Temperature Regulator for Telescopes Lens Less Than 3.15 inch (80mm) in Diameter and Universal Camera

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 80mm "3.15 inches", 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, 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, 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, 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