The SV172 lens warmer temperature adjustment range: 25-70 degrees, and works well even in extreme environments. The SV172 dew heater strip is specially designed for telescopes and can be compatible with a variety of telescopes. Use a hot stamping LOGO with gloss and texture to enhance dew heater strip's visual appeal and sense of quality. The SV172 dew heater strip material: imitation OK cloth+SBR+Black-T+aluminum film+pure cotton, and get a better heating effect. Compared with the old one，the new effective heating length is 430mm and add PWM function Specifications model SV172 Total length of heating tape 550mm Effective heating tape length 430mm Power supply interface type USB Type-A Input voltage DC 5V Output current 2A Rated power: 10W PWM module support With temperature data display Yes Temperature control accuracy 2 degrees Adjustable temperature range 25 degrees-70 degrees Power cord length 1.2m Controller length: 0.3m