Orion 3520 80mm (3-Inch) - 127mm (5-Inch) Telescope Heating Band Heating band for Orion Dew Zapper Pro 4-Channel Dew Prevention System Sized to fit 80mm (3") to 127mm (5") telescopes to prevent dew accumulation from disrupting view quality Features 6' cable with right-angle connection for snug fit Made in the U.S.A. Requires Orion Dew Zapper Pro Control Module for operation - sold separately