Bushnell Fusion X Rangefinding Binoculars BK-7 Center Focus System Roof Prism Black. Their HDOS-High-Definition Optical System-provides optimum viewing clarity while the one-of-a-kind ActivSync Display means you'll never again have trouble reading the ranging readout. Together they make the Fusion X the one tool every hunter needs. Specifications for Bushnell Fusion X 10X42mm Roof Prism Rangefinding Binoculars: Manufacturer: Bushnell Magnification: 10 x Objective Lens Diameter: 42 mm Color: Black Rangefinder Application: Archery Battery Type: CR2 Weight: 35 oz 992 g Length: 7 in 177 mm Optical Coating: Fully Multi-Coated Eye Relief: 0.63 in 16 mm Field of View Linear: 305 ft at 1000 yds Exit Pupil: 4 mm Condition: New Prism System: Roof Prism Material: BK-7 Water Resistance Level: IPX-7 Close Focus: 21 ft Binoculars Focus System: Center Focus Fabric/Material: Composite Package Type: Box Package Contents: Bushnell Fusion X 10X42mm Roof Prism Rangefinding Binoculars Bushnell FX1042AD: Fusion X 10X42 Rangefinding Binoculars BK-7 Center Focus System Roof Prism Black