Come with a 2'' adapter, easy fit into 1.25'' or 2'' focuser, 7 adjustable brightness level. Easy to observe the laser target and adjustthe sealed screws on the body until the red dot is centered, no need to keep looking at the eyepiece of telescope for long time. Feature: Easy and time saving to collimate1.25'' and 2'' telescopes, come with a 2'' removable adapter. 7 adjustable brightness level for amazing alignment in dark and day. Wavelength 635-655nm and less than 5mWoutput power for safe use. Adjust the sealed screws for easy collimation. Aluminumalloy constructed for long time service. Perfect for Newtonian telescope, SCA and Reflector telescope. Specification: Material: Aluminumalloy Output power: