The lightweight, compact Night Owl Optics 3-power monocular has a built in handle strap for more comfort and better handling. Its 3-ring lens body is attractive and robust. This monoculars unique design puts control at your fingertips, making it ideal for hunting, camping, wildlife viewing and security applications. The 42mm lens design is the most popular for a monocular, providing a good balance between desired magnification and a wide field of view. Features: 3x magnification Better-quality generation-1 image intensifier tube Built-in columnated infrared illuminator for use in complete darkness or to improve target recognition in any environment Objective and ocular lenses constructed of high-quality all-glass optics Soft-touch rubberized finish with handle strap Specifications: Magnification: 3x Objective Optic Design: manual focus Lens Diameter: 42 mm Resolution: 35 lp/mm on center Spectral Sensitivity: 400 nm to 900 nm Diopter adjustment: +4 to -4 Minimum Focal Distance: 4.9 (1.5m) Angular Field of View: 19 Field of View at 200 ft. distance: 67 ft. wide (61m / 20m) Dimensions: 6.2L x 2.35W x 3.8H Weight, without batteries: 13.9 oz. Power Supply: requires (1) 3-volt Type-123 lithium battery (not included) Battery Life: 45 to 100 hours, depending on infrared usage Infrared Illuminator, built-in