Carson Hands-Free Hobby Magnifier Set HM-30 is a 3-in-1 LED Lighted magnifier set. Set includes: LED lighted base with clip-on base stand, 2x 110mm rimless round acrylic lens, 2x acrylic Fresnel lens with 2.5x spot lens, 3.5x dual acrylic lens and adjustable length neck strap. Simply snap the lens into the base stand to use and press the release button to swap lenses. The base stand allows you to use as a free standing magnifier while the adjustable neck strap allows you to use hands free. Use AAA batteries (not included).