Optical Materials: 4 Low Dispersion (fluorite) objective lens, the whole surface of the multilayer coating lotus. Magnification: 10x. Effective objective lens diameter: 45mm. Coating: T * multi-layer anti-reflective coating. Prism: Abbe-K nig prism?. The vision at 1000m: 125 m. Eye Vision: 63.0 ° pupil diameter: 4.5mm. A tong distance: 15.5mm. Diopter adjustment: ± 3dpt. Focus wheel adjustment range: -7dpt. Adjustable IPD: 54-76mm. Twilight factor: 21.2 Brightness: 27.6. Shortest visual range: 5M. Filled with nitrogen gas, water, fog. Dimensions: L167 * W135mm. Weight (with battery): 990g. Goggles: four swing-up. Body: the outer fiber reinforced polymer coated magnesium alloy. Accessories: eyepiece cap, lens cap, shoulder strap and lens pouch. Warranty: 10 years. Ranging way: a laser. Working range: 10-1200 meters. Accuracy: 1m measuring time: 1.5 seconds maximum. Laser wavelength: 904nm. Battery: 3V CR2 lithium battery 1. Battery life: at room temperature more than 10,000 times the number of measurements.