Orion 3521 150mm (6-Inch) - 203mm (8-Inch) Telescope Heating Band Heating band for use with Orion Dew Zapper Pro 4-Channel Dew Prevention System and medium aperture telescopes Sized to fit 150mm (6") to 203mm (8") telescope optical tubes 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 4-Channel Dew Prevention System Control Module (sold separately) for operation