Bostron Telescope High-definition Navigation Floating 10X50 with Compass Waterproof Ranging Low Light Level Night Vision Binoculars Model:10X50 Structure:Binoculars Function type:Ordinary telescope Use:Civil telescope Instrument magnification:10 times 1. Specifications: Magnification: 10 times Objective lens diameter: 50mm. Exit distance: 20mm Prism material: BAK4 optical glass Field of view: 7.1 degrees, 124M1000M Waterproof performance: nitrogen-filled and waterproof. Net amount: 890g 2. Lens BAK4 optical glass, 12 layers of anti-UV anti-reflection film, wide field of view, high definition. 3. Features: There is almost no need to adjust the telescope, the objective lens is green film, the one-yuan coin is large eyepiece, the eyes are adjustable, the eyes are very comfortable, and the real long-term can not see dizziness. Not only waterproof, mildew and anti-fog, if you accidentally fall into the water, it will not sink. With a built-in compass, after the battery is installed, pressing the button built-in compass will light up, even if you dont worry about getting lost at night. 4. The 10x50 nautical telescope is a highly sealed telescope with a compass reticle. It has the characteristics of clear field of view, high brightness, good image quality, vivid color and wide adaptability. Its main technical indicators have reached the advanced level of similar products. Therefore, it is suitable for use in transportation, ocean, forestry, aviation, electric power, surveying, etc. Of course, the general nature of use or outdoor tourism, the effect is best. 5. This model is nitrogen-filled and waterproof, can be used around the clock, built-in red LED lighting compass, can indicate 360 a??a??degree orientation. With distance measuring ruler, no need to calculate, can directly read the target distance, 10X50 FMC coating, making the image super clear and bright, stable and comfortable observation. Large depth of field design, the focal length is adjusted once in place, no need to repeat the tedious focus. Ideal for sailing, adventure, outdo