Reduced Distortion 5" Diameter Optical Grade Aspheric Glass Lens. Durable ABS Head Unit houses 90 Switch Activated, High Efficiency LEDs. Lens flap/cover protects glass when not in use, (removable). Heavy-Duty, Steel, Spring Balanced Extension Arm with Cast Iron Mounting Clamp, securely mounts to tables, desks, counter-tops & more. Inner pad is lined to prevent scratching, 2.5” opening max. Rated luminous flux: 420 Lm / Lumen, Power: 6W, Voltage: 60Hz 100V/110-120V, Color temperature: 6000-7000k, Powerful magnification / 3/5/8 Diopter. Lens Power with working distance ranges: APPROX} 3D long work 12”+, 5D Medium Work 12”-, 8D Close Work 6”-.Simple to use, Use caution when unpacking as arms are spring loaded, QUALITY OPTICS USA Since 2008 The perfect companion at your desk, table, work bench. Assistance with any task that requires a detailed view. Premium 2-in-1 lighting & magnification for the professional or home & hobby. Large Optical-Quality glass lens allows viewing of work piece with brilliant clarity. 90 ultra-efficient, 20,000 hour life LED produce eye-pleasing pure white light without the heat build-up of incandescent or halogen. Quick-attach clamp fits anywhere, takes up little space & allows full arm extension without tipping. Lens Power with working distance ranges: APPROX} 3D long work 12”+, 5D Medium Work 12”-, 8D Close Work 6”-. QUALITY OPTICS USA Since 2008