This is a great book light. I love it! I've had it for a while now, and use it all the time while working on my laptop computer. It does seem to go through batteries fast, but that is not a deterrent for me. I really don't know how I got along without it! The only thing I would suggest to improve this, is to put some horizontal grooves on the front part of the clip so that it doesn't slip out of your fingers. Other than that, great product! I would highly recommend!