15x magnification; Floating Prism System uses flexible silicone lens mount to absorb severe shock, impact and abuse without damage; Multi-Coated Optics are state-of-art for brighter picture, higher contrast and sharply contoured images with natural color definition; Sports-Auto Focus System lets you focus each eyepiece to your vision once, then keeps images razor sharp from 20 yards to infinity. No more chasing focus on moving objects; N2 Injection system seals 14-psi pressurized dry nitrogen into the optic, for fogproof clarity in any condition - from artic cold to desert heat; Makrolon housing is durable polycarbonate with NBR Long Life rubber armoring, creating a lightweight, rugged chassis that withstands 11 Gs of impact; Waterproof to 16 feet pressurized nitrogen filled tubes resist water intrusion even when submerged; Tripod Mount is included for perfect image stability for long term observation