https://www.youtube.com/watch?v=5BKTqzRQr80 Author:AstroOnBudget Red laser collimation beam with 7 brightness levels Aim at the target anytime,anywhere,even during the daytime can also be used normally. 7 settings of brightness is useful and easier on the eyes and great for different areas of light Can fit into 1.25" focusers or diagonals (with removable 2" adapter) This is 1.25" laser collimator includes removable 2" adapter;the triple cemented lens to improve the stability of dot;it's designed for accurate collimation of all Newtonian and SCT reflector telescopes Much easier aligned process You no longer go back and forth to the eyepiece, just watch the colimator from the mirror end of the scope and adjust the screws Item Included CR2032 Lithium cell battery Built with metal material, strong and durable SVBONY Red Laser Collimator is made of all-metal material and has a long service life. Warning: 1.Do not look directly into the laser beam! Permanent eye damage may result! 2.Avoid prolonged skin exposure to laser rashes or burns may occur! Specifications:

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