Feature 1Mainly 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) 2Simple,affordable,and effective red dot sighting device aiming your telescope.3Have variable brightness levels,fully adjustable up and down,left and right.4LED dot is projected onto a non-magnifying viewing window so you can aim the main telescope quickly and easily.5Red dot finder scope top part can be removed and used as a replacement for many other red dot finders found on telescopes.SpecificationFeatures: 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 approx Color: Black Material: Plastic Battery: CR2032 Button Battery But Not Included Dimension: Approx.115*70*40mm / 4.5*2.8*1.6in Weight: 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 Scope Telescope in the picture is prop. .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }