Designed for reflector telescope Fit for standard 1.25 and 2 diameter interface with a 2 adapte Red laser with 7 brightness levels Quick alignment;much faster than a manual collimato User adjustable collimator 3 collimation screws on the body to get the laser collimator aligne CR2030 lithium battery Not Included need to prepare by yourself Triple cemented of Lens Improve the stability of red do Much easier aligned process Watch the collimator from the mirror end of the scope and adjust the screw Quality durable metal materials Metal material for a long term us Output power 1mw to 5mw Much safer for eye The Best working distance is 2m 1-5m spots will not change of shap Wavelength:635 to 655nm This is a newest 1.25 red laser Collimator includes removable 2 adapter, Designed for accurate collimation of all Newtonian and SCT reflector telescopes. This high quality laser collimator get can help you get the better image from your telescope, just insert it into the eyepiece holder, adjust laser beam level, then adjust your telescope screw until the laser beam shoots into the target centre. The Lens material is a triple cemented to improve the stability of dot. Warning: Do not look directly into the laser beam! Permanent eye damage may result! Avoid prolonged skin exposure to laser rashes or burns may occur!