Zoom into objects of interest at the press of a button with the Celestron Electric Power Zoom Binocular. This binocular is easy to operate as the 8-24 power zoom can be activated by pressing the button zooming into distant objects. General Features: Fully Coated Optics High Quality BK-7 Prisms Water Resistant Electric Power Zoom - 8 to 24 Power Soft Carrying Case 2 year warranty Technical specifications: Optical design: Porro Diameter: 25 mm (0.98 in) Magnification: 8-24 Zoom x Prisms: BK-7 Optical coatings: Fully Coated Angular field of view: 4.4 Linear field of view (@1000 yds): 231 ft (70.41 m) Exit pupil: 3.1 mm (0.12 in) Eye relief: 10 mm (0.39 in) Near focus: 16 ft (4.88 m) Weight: 12 oz (340.19 g)