Oneeye viewing for sharp closeups Focal length 0.56.2 inches. For focus, view with one eye; using both lenses at once may not produce a clear image. Detachable, interchangeable bracket and headband LED magnifier with interchangeable bracket and headband. This design helps prevent slipping, improves comfort, and reduces fatigue during extended use. Fully adjustable for precise lighting Eye loupe rotates 180 degrees up and down. Light direction can be adjusted left and right to achieve accurate illumination and reduce glare. Four interchangeable magnifications Includes 4 lenses: 10X, 15X, 20X, 25X. Quick lens changes meet different work requirements and viewing distances. Key benefits Hands, comfortable inspection with secure wear and adjustable lighting. Versatile magnification range suitable for a variety of detail tasks. Quick lens swaps enable seamless transitions between magnification levels without tools. What it works well for (use scenarios) Jewelry and watch work: inspect settings, prongs, and tiny components with precision. Electronics and PCB inspection: examine solder joints, fine traces, and small components. Collectibles, stamps, coins, and model making: read tiny text, verify markings, and work on intricate details. Specifications and compatibility Focal length: 0.56.2 inches. Magnification: 10X, 15X, 20X, 25X (four interchangeable lenses). LED illumination with adjustable light angle for consistent, focused lighting. Bracket and headband are detachable and interchangeable for fit, comfort, and stability.