Features:Mainly be fit for Celestron 80EQ SE SLT PS series and meade infinity and polaris and so on series astronomical telescope (Note: Meade Infinity Series: 80AZ 90AZ 102AZ and Polaris Series: 80EQ 90EQ not applicable)Simple, affordable, and effective red dot sighting device aiming your telescope.Have variable brightness levels, fully adjustable up and down, left and right.LED dot is projected onto a non-magnifying viewing window so you can aim the main telescope quickly and easily.Red dot finder scope top part can be removed and used as a replacement for many other red dot finders found on telescopes.Specification:Allow mounting with hole distances from 5/8 to 1 inch approxColor: BlackMaterial: PlasticBattery: CR2032 Button Battery But Not IncludedDimension: Approx. 115*70*40mm / 4.5*2.8*1.6inWeight: Approx. 40gHow to Use:Electric light shot on the lens showing red dots, the use of three points to determine a straight line principle to find the stars.Package List:1 * Red Dot Finder ScopeTelescope in the picture is prop..