We offer ent surgical loupe. Features:ocular power: 2.5 x, 3.0 x (most popular) or 3.5 x magnification pupillary distance: adjustable for perfect optical alignment and stereoptic view (single or multiple users) resolution: highest grade optical glass lenses working distance: 340mm (13.4") mount: dual adjustable headband weight: 12 oz. design: for single or multiple users, may be used with or without prescription glasses ent led surgical loupe headlight specificationsfeatures: led illumination: 30, 000 lux (adjustable) illumination spot size: adjustable intensity: full variable intensity control dial (0-100%) color temperature: 6, 000kelvin pure white shadow-free light life: 20, 000 hours of life battery: rechargeable lithium ion.