Function: 1. Anti-slip design with vertical strap, using concave-convex anti-slip design with vertical strap, allows smoother focus adjustment, turning left and right back and forth, easy focusing, simple and convenient operation. 2. 3. With the side on the back of the do hole hanging thread, you can drag the thread and hang it around your neck, making it more comfortable to wear. 4. Irregular, non-slip, concave-convex texture on the lens body to prevent slippery, more stable holding, more comfortable do carry out. 5. Lens design with multi-layer coating, the lens is made of 30MM caliber, it is transparent, which reduces light loss, light absorption will be better and effectively improve the light transmission rate. Specification: Material: metal and bronze Color: as picture shown Weight: approx. 1286g Structure: Binoculars Specification: 8X30 Magnification: 8 times Output pupil diameter: approx. 3.7mm/0.1in Output pupil distance: 11,2 MM Eye distance adjustment range: 56-74MM Lens Level: BAK4 prism Lens diameter: approx. 30mm/1.2 inch Eyepiece diameter: approx. 25 mm/1 inch (very large eyepiece) Operating temperature: -43 - and 55 ℃ Storage temperature: -55 - and 70 ℃ Diopter adjustment range: 4 diopters Mesh value: 5mil/mesh: Range: 10 meshes at the top and bottom (50mil) 10 meshes on both sides (50mil) Waterproof: Waterproof filled with nitrogen Focusing method: focusing with left and right eyepiece Matte shell: durable NBR shell It can roughly measure the distance and orientation of the target relative to you. The scale on the grid has a vertical grid, a horizontal grid and a targeting distance grid. Horizontal division and vertical division have a cell value of 5 dense bits, and a large cell value of 10 dense cells. The sight partition is designed so that the height of the side target is 2 meters. The measuring range is from 400M do 2000M. In the 1000M field of view, the value of each small grid is 100M, and the value of each large grid is 500M. List of packages: 4 x Eyepiece Cover 1 x do wipe cloth 1 x Brush