Designed Compatible With reflector telescope. Fit Compatible With standard 1.25 inch and 2 inch diameter interface with a 2 inch adapter.Uer adjustable collimator3 collimation screws on the body to get the laser- collimator aligneSpecially designed Compatible With Reflector telescope with 1.25 inch focuser.Adjustable 7 brightness levels, easier to handle than a manual collimated eyepiece.Black metal solid construction with good aluminum painting process.New generationSize: 1.25 inchWavelength: 635-655nmOutput power 1mw- 5mwMuch safer Compatible With eyeBrightness: 7Powered by: 1*CR-2032 (not include)Size: 1.25 in /2 inMaterial: Metalcolour: blackPackage Contents:1 x collimatorOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.