BIAL 20X50 Zoom Binocular Waterproof Super High-Powered Surveillance Binoculars with Sit Scale Range Material: Rubber non slip surface Focus: Center the handwheel adjustment and right eyepiece parallax adjustable Porro-prism binocular with 20x magnification and 50mm objective diameter Shockproof,Water & Weather Resistant and Rubber Coated For Protection From Bumps, Drops & Scratches Fully coated optics for improved clarity and light transmission.Quality optics with stunning HD clarity