Carson Hobby Magnifier 3-in-1 LED Lighted Magnifier Set. To use simply select from the three lenses included and snap the lens into the base stand. Press the release button to remove the lens and select a new one. The base stand allows you to use as a free standing magnifier while the adjustable neck strap allows you to use hands free. Crystal clear acrylic lenses and two super-bright LED lights ensure a crisp bright-magnified image. Use AAA batteries (not included). The Hobby Magnifier can be used for all hobbies and crafts. Remove the lens for use as a booklight. Specifications for Carson Hobby Magnifier 3-in-1 LED Lighted Magnifier Set: Manufacturer: Carson Additional Features: Lens Diameter (Dual Acrylic Lens) - 5in Magnification (Dual Acrylic Lens) - 2.5x Lens Diameter (Acrylic Fresnel Lens) - 3.5in Lens Diameter (Rimless Round Acrylic Lens) - 4.3in Spot Lens (Acrylic Fresnel Lens) - 2.5x Magnification (Acrylic Fresnel Lens) - 2x Magnification (Rimless Round Acrylic Lens) - 2x Features of Carson Hobby Magnifier 3-in-1 LED Lighted Magnifier Set Magnification 2x 2x/2.5x 3.5x Lens Diameter 110mm (4.3") 90mm (3.5") 130mm (5") Carson Hobby Magnifier 3-in-1 LED Lighted Magnifier Set Includes: LED Lighted Base w/ Clip-On Base Stand 2x 110mm Rimless Round Acrylic Lens 2x Acrylic Fresnel Lens w/ 2.5x Spot Lens 3.5x Dual Acrylic Lens Adjustable Length Neck Strap Carson Hobby Magnifier 3-in-1 LED Lighted Magnifier Set HM30