Solomark 7 Bright Level 1.25" Next Generation Telescope Laser Collimator for Newtonian Telescopes(without Battery) Red laser collimation beam with 7 brightness levels Can fit into 1.25" focusers or diagonals Wavelength 635-655 nm;Output power: less than 5mw CR2032 Lithium Cell battery (not included);7*24 hours customer service,please buy with confidence:) Removable 2" adapter;Built with metal material