NOB5X Features: -Adjustable focus with central focusing mechanism.-Integrated infrared illuminator.-Two high-quality generation-1 image intensifier tubes.-Impact-resistant molded thermoplastic lens housings.-Padded neck strap.-For camping, hiking, wildlife, hunting, security.-Magnification: 5x.-Lens diameter: 50mm.-Angular Field of View: 12.5.-Field of View at 200 ft. distance: 44 ft. wide (61m / 13.4m).-Minimum focus range: 6.6 ft.-Interocular distance: adjustable from 57 mm to 73 mmli>.-Power Supply: requires (1) 3-volt Type-123 lithium battery (not included).-Battery Life: 40 to 80 hours, depending on infrared usageli>. Specifications: -Power supply: CR-123 3V lithium (i). Dimensions: -Dimensions: 8.00 L x 5.85 W x 2.60 H.