The light up "wand" in this set doesn't turn off. And loading/unloading batteries requires screwdrivers, strength, and patience, so it doesn't seem like something you should do before/after a 20-min coloring session.
WHY DOES IT NOT TURN OFF?! It just stays lit light a little tethered flashlight, wasting batteries and getting hot. WHY?
http://www2.crayola.com/products/splash/color_wonder/light-up-markers/