Steiner Navigator Pro C Binocular, 7x30 Equipped with an hd stabilized compass in a compact frame, for clear images and reliable headings in an easy-handling size High contrast optics provide bright, sharply contoured images with natural color definition for outstanding viewing quality suitable for both beginners and professionals Floating Prism System uses flexible silicon lens mount to absorb severe shock, impact and abuse without damage 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 fog proof clarity in any condition - from artic cold to desert heat