The HM-30 Hobby Magnifier is a 3-in-1 LED Lighted Magnifer set. Set inlcudes: LED lighted base with clip-on base stand, 2x 110mm rimless round acrylic lens, 2.5x acrylic fresnel lens with 3x spot lens, 4x dual acrylic lens and adjustable length neck strap. 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.