Astromania Finder Deluxe Telescope Reflex Sight Finder Deluxe features a large viewing window, four different aiming reticle patterns to choose from, and five brightness levels. Horizontal and vertical fine-adjustment set-screws allow precise alignment of the reflex sight with the telescope. Includes dovetail finder bracket that fits most telescopes. Requires CR-2032 lithium button-cell battery (Not Include). The Finder Deluxe is a non-magnifying reflex sight that makes aiming your telescope easier and more accurate than ever - day or night! Finder projects a small red or green LED reticle pattern onto a viewing window so you can easily aim your telescope at night or during the day.