This dew warmer offers good dew protection. It can be used with any 5V USB power supply, but I would recommend that what you use must be at least 1 amp. With a 1 amp power supply, my 22mm panoptic eyepiece was completely dew free at night when the temperature dropped to 10 degrees Fahrenheit. It should fit most large eyepieces, but if I have any complaints it's that it's a bit shorter to work twice. Mandatory on small refractor lenses. Construction and materials appear to be of good quality and should stand up to cold weather use where I will be using it first.
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