TECHNICAL SPECIFICATION Generation: One Magnification: 3x Lens Diameter: 42mm Field of View: 20 degree Resolution, typical: 32-36 lp/mm Focus Range: 1 to infinity Eye Relief: 12mm Diopter Adjustment: +5, -5 Detection Distance, approx.: up to 200 yds IR Illuminator Effective Distance: up to 150 yds Power Supply: CR 123 3V Operating Temperature: -22 to +104 Dimensions: 7.2 x 4.8 x 2.8 inches