Come with 2 adapter, easily fit 1.25 or 2 eyepiece holder, 7 levels of brightness adjustable. Easy to observe the laser target and adjust the screws sealed on the body until the red dot is centered, no need to keep looking at the telescope eyepiece for a long time. Feature: Easy and time-saving to collimate 1.25 and 2 telescopes, delivered with a removable 2 adapter. 7 adjustable brightness levels for incredible alignment in dark and daylight. 635-655nm wavelength and less than 5mW output power for use securely. Adjust sealed screws for easy collimation. Aluminum alloy constructed for long life service. Perfect for le tlescope newtonien, le SCA et le tlescope rflecteur. Spcification : Material: Aluminum Alloy Output Power: Brightness: 7 Powered by: 1*CR-2032 (not included) Size: 103.4 * 31.7mm / 4, 0 * 1.2 inches Total length: 137 mm / 5.3 inches Weight (collimator): 82 g / 2.8 oz Weight (adapter): 53 g / 1.8 oz Package weight: 251 g / 8.8 oz Package size: 21 *8.5*5.8cm/8.2*3.3*2.2in Package List: 1 * collimator