The binoculars with the sailor's compass - built-in ruler for measuring distance and built-in compass for orientation. By specifying the ruler, you can directly calculate the distance to the object on the left eyepiece. With the integrated light-emitting compass you can calculate the orientation (in a dark environment, the ruler and the compass are illuminated by the light button)Double strap - a wide thickened neck loop, a shoulder strap; You can use one of these to make this great product easy to carry and use for a long time.Professional optical glass and coatings - 50mm lens, 26mm oversized BAK4 eyepiece, the lens with a green FMC anti-reflective coating and the eyepiece with a blue FMC coating contribute to a significant reduction in the reflected light in the objective lens, an effective improvement in light transmission , a great improvement in image brightness and sharpness, good performance in low light conditions;The focusing system with the binoculars - The military-grade left and right eyepieces can adjust the focus to 100% meet the different vision requirements in accordance with the left and right eyes; The eyepiece cover can be folded quickly so that you can use it very easily with glasses; With the eco-friendly rubber skin design and uneven lines, your hands can easily stick to the binoculars;