12x42 monocular with large magnification and a 42 mm objective lens for bright, detailed outdoor viewing. It uses a BAK-4 prism and multi-layer coated green film objective lens for clearer, brighter images. Amazing Vision: see distant scenes more clearly. Rotate to focus, then adjust focus and zoom until the image is crisp. High light transmittance delivers clearer, higher contrast views in varied lighting. Advanced configuration: Our condensing telescope adopts new optical manufacturing technology, equipped with a BAK-4 prism and multi-layer coated green film objective lens, which can effectively avoid vignetting and reduce visual fatigue. One-handed operation design: handheld and easy to use with one hand for quick, accurate focusing on the target. IPX7 nitrogen-filled and waterproof, with anti fog coating and O ring sealed optical components to prevent moisture, dust and debris, helping keep the lens clean. Key attributes: compact handheld design with 12x42 specs; BAK-4 prism; multi-layer coated optics; durable waterproof, fog resistant performance; suitable for outdoor use in varying conditions. Use scenarios: - Birdwatching or wildlife observation in forests or parks. - Hiking, travel, and sightseeing to spot distant landmarks or scenery. - Outdoor sports events or concerts where quick, clear distant viewing is beneficial.