Specifications:
1. 1.5X/2X/2.5X/3.5X Optical Head Loupe Helmet Head Band Magnifier
2. Adjustable buckle head wearing tape
3. Interchangeable lens plates
4. Magnifying Ratio&Focus:
1.5X / 20inches
2X / 10inches
2.5X / 8inches
3.5X / 4inches

Package Contents:
1 * Headband Magnifying Glass MG81007-B
4 * Lense Plates of 1.5x, 2x, 2.5x, 3.5x
4 * Plastic Screw
1 * Product Manual

Note:
The focus distance is differ from person with different interpupillary distance, just for your reference. 

If there is any questions, just contact us, we will alway be here for you.