[list] [*]Product Information [*]The Orion Dew Zapper Pro is an advanced 12-volt DC dew prevention and elimination system which can power up to four heating bands to prevent dew accumulation on all your optics (heating bands sold separately) [*]Microprocessor-controlled circuitry delivers pulse-width modulation for precise temperature control of up to four heating bands [*]Each heater output has its own temperature control knob with adjustment from 0% to 100% so you can set each one to your preference [*]Heating bands are power-efficient, drawing only 0.25 amps to 2.8 amps at maximum output (heating bands sold separately) [*] Made in the U.S.A. [/list]