These are the first premium binoculars offering the versatility of multiple magnifications. With just a simple rotation of the eyepiece rings, the Duovids can be adjusted from low-power settings to a high- power setting (either 8X-12X or 10X-15X) for incredible versatility. And, they maintain both focus and diopter settings throughout the power range. Fully multicoated lenses with Advanced Plasma Source protection coating on all external lens surfaces. Removable, multi-position, twist-adjustable eyecups gives eyeglass wearers a full field of view. They have ergonomic, soft-touch rubber armor for easy handling. They are 100% waterproof and fog-proof.