MULTI-COATED OPTICS AND BaK-4 PRISMS: Multi-coated optics provide high resolution and high contrast views, while BaK-4 glass prisms provide enhanced color fidelity. You'll enjoy crisp, detailed views of distant subjects. WATERPROOF AND FOGPROOF: Designed to withstand all weather conditions, Outland X compact binoculars are filled with dry nitrogen gas and then sealed for rigorous outdoor use without internal fogging of the lenses. PROTECTIVE RUBBER ARMOR: A durable rubberized exterior protects from hard use and harsh outdoor conditions while providing a secure, anti-slip gripping surface. Its sturdy construction makes Outland X a great travel or birdwatching binocular. TWIST-UP EYECUPS FOR QUICK ADJUSTMENT: Large focus knobs make for easy and precise focusing. Twist-up eyecups allow you to customize the binocular's eye relief to obtain a full field of view with or without eyeglasses. UNBEATABLE WARRANTY & CUSTOMER SUPPORT: Buy with confidence from Celestron, a leading optics brand in California since 1960. Your purchase includes a Celestron Limited Lifetime US Warranty & US-based expert tech support.