Vortex Viper 10x28 Pocket Binocular
 
XD Lens Elements - Extra-low dispersion (XD) glass increases resolution and color fidelity, resulting in crisp, sharp images.
XR Fully Multi-Coated - Proprietary coatings increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces.
Dielectric Prism Coatings - Multi-layer prism coatings provide bright, clear, color-accurate images.
Phase Correction - Coating on roof prism models enhances resolution and contrast.
Roof prism - Valued for greater durability and a more compact size. 
Waterproof - O-ring seals prevent moisture, dust and debris from penetrating the binocular for reliable performance in all environments.
Rubber Armor - Provides a secure, non-slip grip, and durable external protection
ArmorTek - Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt
Adjustable Eyecups - Twist up and down for comfortable viewing with or without eyeglasses.
Center Focus Wheel - Adjusts the focus of both binocular barrels at the same time
Locking Diopter - Adjusts for differences in a user's eyes.  Located on the right eyepiece
Magnification - 10x
Objective Lens Diameter - 28mm
Eye Relief - 19mm
Exit Pupil - 2.8mm
Linear Field of View - 267 feet/1000 yards
Angular Field of View - 5.1 degrees
Close Focus - 7.5 feet
Interpupilary Distance - 56 - 73mm
Height - 4.7 inches
Width - 4.5 inches
Weight - 12 ounces