These Waterproof and Fogproof marine binoculars are an excellent choice for the recreational sailor. They feature an Internal Illuminated Range Finder, Internal Compass, are nitrogen filled and have Ruby Coated Lenses AND BAK 4 prisms. Included is a carrying case and strap, and best of all, with the strap attached these durable binoculars even float! This is a must have for anyone needing a good set of binoculars.