Celestron Oceana 7x50 Porro WP CF & RC Binocular, Black 50 mm Porro Backlit illuminated liquid dampened magnetic compass. excellent navigational tool for land or sea.Horizontal and vertical etched reticle to help determine relative size of objects Range finding dial calculates actual object distance or size.Completely waterproof  dry nitrogen charged and sealed with internal O-rings to prevent internal fogging - unaffected by climate and temperature changes Excellent depth of field for minimal focus adjustments.Nautical style padded canvas case and straps Attached objective caps.Tripod adapter fitting for tripod mounting Backlit illuminated liquid dampened magnetic compass  excellent navigational tool for land or sea Individual eyepiece focus Rangefinding dial calculates actual object distance or size Completely waterproof Horizontal and vertical etched reticle to help determine relative size of objects