1. Clear vision: Thanks to the dual-focus design, it provides high light transmittance, focusing provides you with brighter, high-contrast images. The eyecup can be rotated upward to focus the view by yourself, and then adjust the focus setting and zoom setting until the image becomes clear. 2.10-30X40 Powerful Magnification: Enhanced magnification from 10x to 30x, providing a wider, clearer and brighter field of view. Adjust the magnification of this zoom monocular according to your needs, so that you can enjoy a wonderful world. 3.D Large and comfortable lens and eyepiece: The monocular is equipped with a BAK4 prism with FMC green film and HD blue film, as well as an improved 20mm eyepiece and 40mm objective lens, which can expand your field of view without limiting your vision. 4. Waterproof and fog-proof design: Made of aluminum alloy and rubber, high-purity nitrogen fills the compact monocular to prevent dust from entering. Make this high-definition monocular waterproof and fog-proof in any weather and environment.