Solomark Telescope Alignment 1.25" Next Generation Laser Collimator 2" Adaptor for Newtonian Telescopes 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, much safer for your eyes CR2032 Lithium Cell battery(not include); 7*24 hours customer service, please buy with confidence With Removable 2" adapter; Built with metal material