The telescope is suitable for indoor and outdoor use, portable10-30X50 Zoom-Objects close to 10-30X, clear vision.50mm Full Color Coated Lenses-Increases light transmission for the best experience with most light.Roof prism design-slim profile and durability.BAK-4 PRISMS-Optimized transmittance.Waterproof and fog-free-Nitrogen sealed body provides water and fog protection in any weather and environment.Rubber Eye Clip-Adjustable eyecup with adjustable up and down, you can watch comfortably with or without glasses.CENTER FOCUS WHEEL- Adjust the focus of two binocular tubes at the same time.Right eye diopter-the difference that fits one eye user. Position through the right eyepiece.Product introduction:Colour: BlackMagnification: 10-30xObjective lens diameter: 50mmEyepiece diameter: 17mmObjective lens coating: multilayer coatingEyepiece coating: multilayer coatingPrism material: BAK4Weight: 453gProduct size: height 190x width 80 (mm)Product features: 10-30 times continuous zoom, 50 large caliber, sufficient light input, bright imagingStandard: telescope, dust-proof objective lens cover, dust-proof eyepiece cover, special soft bag, lens cleaning cloth, anti-counterfeiting packaging box, service warranty card