Nitrogen-filled waterproof with a fog-resistant coating and O-ring sealed optics prevent moisture, dust and debris. The weight of hd monocular is only 0.61 pounds that is lightweight and portable.Our monocular scope even can be put in your backpack and be taken to anywhere. Our monocular features a screw hole to connect the tripod that will make it more stable to observe birds or other things in outside. The 42mm FMC green film objective lens and BAK4 prism（Higher Light transmittance than BK7 prism） allows more light transmission and gains more brightness. 12X Magnification, make your view brighter, clearer and deliver crisp images. Perfect for outdoor activities such as climbing, hiking, driving, watching wildlife and scenery. The eye relief can be adjusted by simple rotation, which makes it suitable for both naked eyes and glasses wearer.