Steiner Model 7655 Navigator Pro 7x50 Binoculars N2 INJECTION SYSTEM - Seals 14-psi pressurized dry nitrogen inside the optic, for fogproof clarity in any condition - from artic cold to desert heat. FLOATING PRISM SYSTEM - Uses flexible silicone lens mounts to absorb severe shock, impact and abuse without damage. SPORTS AUTO FOCUS - Delivers, once shot, always sharp, briliant 3D images from 20yds to infinity without refocusing, perfect for your active life. MAKROLON HOUSING - Durable polycarbonate with NBR rubber armoring creates a lightweight, rugged chassis that withstands 11 Gs of impact. Impervious to harsh conditions for generations of use. HERITAGE WARRANTY - We stand behind our products. Period! We will repair/replace defective products at no charge for the lifetime of the product. Warranty does not cover damage, loss or theft.