This set includes 3 groups of arthropod specimens – insects, arachnids and myriapods. Using the viewer to illuminate these specimen slides provides children with an exciting way to investigate the amazing Animal Kingdom. The Teacher’s Guide includes classification and fascinating facts to extend children’s curiosity about this group of animals. The LED Slide Viewer adds another dimension to the Mini Beast Specimens. Lights on the sides and bottom of the viewer illuminate the specimen slides in a way children will find amazing. Powered by an alkaline button battery secured by a screw, the Slide Viewer offers over 800 hours of viewing time.