Product Description 1. 300x40 monocular telescope with a 30mm objective lens diameter, providing better clarity for observing scenery, ideal for sightseeing, hunting, birdwatching, exploration, and other outdoor activities. 2. Waterproof folding monocular telescope with a completely sealed tube. We have passed multiple rigorous waterproof tests to ensure the telescope will not fog up or leak water in low-temperature, low-humidity environments. 3. Prism and multi-layer coating: Both the eyepiece and objective lens use high-quality all-optical BAK4 prisms with a wide-band green coating, achieving up to 98% light transmittance, allowing you to clearly observe targets and obtain higher brightness and color reproduction. 4. Adjustable focusing wheel + eyepiece design: The focusing wheel allows for quick adjustment of the image center and surrounding areas, achieving overall high resolution and avoiding localized image blurring. The adjustable eyepiece is suitable for people with normal vision and those who are nearsighted. ^ 5. High-quality components feature a finely textured frosted surface to effectively prevent slippage and sweat stains. The glasses feature a sturdy lanyard hole on the side, allowing them to be hung around the neck for easy carrying over long distances. ^