Navigation rangefinder compass- Illuminated Compass built-in for direction location and internal rangefinder for determining distance and size of objects. A switch in the binoculars compact used in darkness to bright the internal rangefinder scale.Premium BAK4 prism - Fully multi-coated optics and BAK4 prism produce clear and bright image. Porro prism system provides a wide field of view, improves light transmission. Professional optics offering excellent users experience.Tripod Connector is included - Tripod adapter fitting to tripod mounting for increased stability, can be used in many conditions, such as for hunting, marine, bird watching, boating, fishing and so on.Waterproof and Fogproof - Nitrogen filled water resistant, binoculars can used even in some bad weather condition. Non-slip rubber armor provides a firm grip.