Orion 3519 2-Inch Eyepiece and 40-50 mm Finder Scope Heating Band Heating band for Orion Dew Zapper Pro 4-Channel Dew Prevention System Sized to fit 2" telescope eyepieces and 40mm to 50mm finder scopes to keep dew from accumulating on optical surfaces 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)