The for BOSTRON telescope is designed entirely for the needs of outdoor sports, with reliable quality and meeting the diverse requirements of outdoor activities. Ensure higher brightness and contrast comprehensively, especially in dim environments, More details of the scenery can be seen than ordinary telescopes. Coated prism, clear imaging: BAK4 coated prism ensures clear and bright image quality even at the edges. Anti mold and anti fog, can float on the water surface: Nitrogen filled, waterproof, mildew proof, and fog proof are completely suitable for outdoor environments. Short tube design, can float on the water surface, Built in distance measuring and dividing board, specially designed distance measuring and calculating ruler. Comprehensive multi-layer broadband anti reflective (green) film, realistic color reproduction. 100% Brand New Type:Binoculars Adjustable Magnification: Not adjustable Effective caliber (mm): 50 Field of view ft/1000 yds: 396 Prism material: BAK4 Exit pupil diameter (mm): 17 Relative brightness: 50 Exit pupil distance (mm): 24 Waterproof, anti fog, and shockproof: Yes Recent observation distance (mm): 4 Footstand interface: Yes Specification:10X50 Colour:Black Material:engineering plastic Package Contents: 1 x Binoculars 1 x eyepiece cover 1 x Bag 1 x English manual 1 x shoulder strap 1 x mirror cloth Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.