Watch birds in their natural habitats or stalk prey in the woods with the Celestron Trailseeker Binoculars, which feature fully multicoated optics and BaK-4 prisms for great contrast and resolution and bright views. The metal multistop twist-up eyecups allow correct eye positioning, and the wide field of view lets you quickly acquire and follow your subject. Nitrogen purged to prevent internal fogging and waterproof to keep out the elements.