One piece tube built on strong cardan joint platform to fulfill the most demanding requirements. Integrated sun shade Great field of view and unlimited eye relief Side wheel to adjust red/green dot intensity One piece tube built-in integral sunshade for maximum strength Fully sealed and nitrogen filled. Shockproof, fog-proof and waterproof. Quick aim and instant lock on target Magnification: 1.00X Tube Diameter: 30mm Objective Diameter: 25mm Field of View @ 100 yards: 31.0' Eye Relief: Flexible Exit Pupil: 22.0mm Click Value @100 yards: 1/2" Length: 7.6" Weight: 13 oz Batteries: CR1620 3V (included)