The Monarch waterproof ATB (All Terrain Binoculars) are engineered for the hunter or extreme outdoorsman. These wide angle binoculars each feature large 40 mm objective lenses. They deliver superior optical performance in very low light situations and in all challenging environments. Features heavy gauge rubber armored, 100% waterproof/fogproof nitrogen filled and o-ring sealed, long eye-relief for eyeglass wearers. #7345 has a 330' field of view, length: 5.7" and weight: 21.3 oz.