Its about time someone designed a book light that you can recharge. Not only is it very functional, its adorable. This 9 inch light clips onto your book, kindle, or sheet music, and gives you hours of surprisingly bright light. When it starts to die on you, pull the stem out of the clip, and plug it into your USB charge port on your computer. Wait a little, then its recharged. (I don't let mine discharge all the way. That way I can depend on it, if I'm away from the computer when it runs out of power.) The problem with these clip on book lights that I always had, is that I fall asleep when I read.  The light would stay on for a few hours, wasting the batteries. Then, I couldn't find the right round batteries for the light, or never put them in, etc. So this light will pay for itself, in batteries saved alone. Plus, you get a blue monkey, so there's that too.