Astromania USB Dew Heater Strap

  Lens Heating protects the lens of your camera or telescope before freezing and fogging. Adjustable sizes suitable for most smaller telescopes and camera lenses 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 USB 5V power - works with ASIAIR and any USB power bank. Available in two lengths: 25mm strip for up to 80mm outer diameter lens or guide scope 40cm strip for up to 120mm outer diameter lens or telescope  RedCat 51, RedCat 61, RedCat 71 ZWO FF65 & FF80 Refractors Most other 80mm or smaller refractors with an outside diameter lens shield less than 125mm