SVBONY Dew Heater Strip DN40cm 5V for Telescopes and Camera DSLR Lens Linear Temperature Control Devices Keep Them from Fog Dew Freezing

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Feature

Super fast and continuous warming with fast start up of 5 seconds to heat
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
Based on the USB 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 USB port
DN40: the length is 40cm, for outside diameter: 13cm, lens UV size is less than 110mm
With adjustable diameter and easy adherence;this dew heater strip fits to most size of telescope;finder scope;digital camera;One heater strip to warm them all