Characteristics:<br> It mainly fits do series Celestron 80EQ SE SLT PS and astronomical telescopes series meade infinity and polaris etc.<br> A simple, affordable and effective do collimator sight device aimed at your telescope.<br> They have variable brightness levels, fully adjustable up and down, left and right.<br> The LED dot is projected onto a non-enlarging observation window, so you can quickly and easily aim the main telescope.<br> The top of the Red Dot finder can be removed and used as a replacement for many other Red Dot finders found in telescopes.<br> . Red Dot Scope Viewfinder Star Finder do telescope<br> . Red Dot Scope Viewfinder Star Finder do telescope<br> Specification:<br> They allow installation with hole distances from 5/8 do 1 inch approx.<br> Black color<br> Material: plastic;<br> Battery: CR2032 button battery, but not included<br> Dimension: Approx. 115*70*40mm/4.5*2.8*1.6in<br> Weight: Approx. 40g<br> Usage:Electric light fired into the lens showing red dots, using three do determine the principle of a straight line to find stars.<br> . Red Dot Scope Viewfinder Star Finder do telescope<br> . Red Dot Scope Viewfinder Star Finder do telescope<br> List of packages:<br> 1 * red dot sight;<br> . Red Dot Scope Viewfinder Star Finder do telescope<br> . Red Dot Scope Viewfinder Star Finder do telescope