1; Tripod Design: Anti-shake system; special tripod 3D gyroscope; very stable during multiple zooms.2; Clearer Scenes: BAK4 prism lens; 30 times closer and large field of view; clearer and more colorful scenes. Excellent light transmittance and brightness; brighter and clearer images.3; Night Vision Function: Built-in night vision function; you can see when there is light at night. Turn on the auto focus and blur the background; you can focus on people or objects need to be observed.4; Moisture-proof and Waterproof: The Nitrogen-filled waterproof and O-ring optical components can prevent moisture; dust and debris; and ensure service life. The bracket better fits your phone; allowing you to take beautiful photos and adapt to harsh environments.5; Suitable Group: Suitable for outdoor sports enthusiasts and wilderness explorers; an essential equipment for bird watching; wildlife; hunting; hiking; mountain climbing; camping and travel.1.Tripod Design: Anti-shake system;  special tripod 3D gyroscope;  very stable during multiple zooms.2.Clearer Scenes: BAK4 prism lens;  30 times closer and large field of view;  clearer and more colorful scenes. Excellent light transmittance and brightness;  brighter and clearer images.3.Night Vision Function: Built-in night vision function;  you can see when there is light at night. Turn on the auto focus and blur the background;  you can focus on people or objects need to be observed.4.Moisture-proof and Waterproof: The Nitrogen-filled waterproof and O-ring optical components can prevent moisture;  dust and debris;  and ensure service life. The bracket better fits your phone;  allowing you to take beautiful photos and adapt to harsh environments.5.Suitable Group: Suitable for outdoor sports enthusiasts and wilderness explorers;  an essential equipment for bird watching;  wildlife;  hunting;  hiking;  mountain climbing;  camping and travel.Specification :Model: 10-300x40Effective diameter of objective lens: about 30mm/1.3inMagnification: 7-17 times (corresponding to adjustment level 10X100)Eyepiece diameter: about 22mm/8.27inExit pupil diameter: 4.2-1.7mmExit pupil distance: 14-12mmActual field of view: 230-110FT 1000YDSActual field of view: 4.4-2.1 degreesThe shortest focusing distance: 2.5mSize: about 173/128x43mm (stretching and shrinking)Weight: about 300gPrism: BAK4 prismCoating: FMCColour: blackEye mask: rotating eye maskWaterproof: yesTripod can be connected: yesWhether to connect the mobile phone: yesUsed for: racing;  beach;  bird watching;  boating/yachting;  horse racing;  outdoor activities;  sports;  drama;  travelMaterial: optical glassType: monocular