The Steiner TSeries Tactical binocular reflects hardwon experience with features ergonomics and visual excellence that are unsurpassed anywhere and rugged reliability that can survive anything. Its roof prism design is extremely light weight compact and streamlined while high definition optics are specially coated for the highest light transmission sharp edgetoedge views and contrast even in low light. The FastCloseFocus central focusing wheel requires minimal rotation for quick absolute sharpness from close up to infinity. The TSeries military grade rubber armoring protects chassis lenses and has N2 injection system which seals 14psi pressurized dry nitrogen into the optic for fogproof clarity in any condition. A ClicLoc system attaches and releases your neck strap or harness instantly with push button ease.