We have commodity security services. If the product you received has quality problems, please feel free to contact us, we can provide you with a return service.Durable,high quality material is also suitable Compatible with harsh environments.Specifications:Magnification: 10 times - 30 times,between 10 times and 30 times can be adjusted as neededEyepiece caliber: 13mmObjective lens diameter: 25mmPrism category: bk4Coating: Multilayer Broadband Green FilmDimensions: Shrinkage size:130*40*40mmField of view: 10 times: 3.5° to 30 times: 2.0°Package included:1* Monocular TelescopeNotes:1. Due to the difference between different monitors,the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Due to different personal measuring techniques,there might be 1-3cm error of the physical.