1. One-hand focus, waterproof and fog proof: An ergonomic design lets you focus quickly and accurately with one hand. The long-lasting rubber armor with stripes provides a comfortable, non-slip grip and durable external protection. Nitrogen-filled with a fog-resistant coating and O-ring sealed optics prevent moisture, dust and debris to keep the view clear. 2. High contrast and resolution images: HD monocular telescope with BAK-4 prism and fully multi-coated lens delivers superior light transmission and brightness. Light transmittance reaches up to 99.5%. It has low-light capabilities for viewing in dim conditions, providing a clear viewing experience (not in complete darkness). 3. Applications: Suitable for adults at concerts, theater, opera, plays and shows, as well as for travel, hiking, camping, sports events, and bird watching. 4. Smartphone compatibility: Includes a 2019 est quick alignment smartphone holder and tripods, compatible with almost all other smartphones. Easy to install and enables you to capture HD images or videos to share with friends.