1、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) 2、Simple, affordable, and effective red dot sighting device aiming your telescope. 3、Have variable brightness levels, fully adjustable up and down, left and right. 4、LED dot is projected onto a non-magnifying viewing window so you can aim the main telescope quickly and easily. 5、Red dot finder scope top part can be removed and used as a replacement for many other red dot finders found on telescopes. 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 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.