This is a very nice book light.  It has 2 brightness settings:  1 light on and 2 lights on.  So, you can adjust how bright you want it to be.  I like this feature, a lot.  It also comes with 3 AAA batteries, so you're set to go the minute you receive it.  The problem is that the clip-on part is so big it obscures my Kindle.  The bottom of the clip is about 2" X 1/1.5".  Better clips for a Kindle don't take up so much room.  Also, this clip doesn't fold up very well.  It's not compact, which also makes it less convenient for a Kindle.  The clip also slides around a lot on the Kindle.  It is find on a regular (paper) book.  But, the hard plastic of this light's clip against the hard plastic of the Kindle causes it to move around while I'm reading, which is annoying.  I recommend this for anyone looking for a book light, but not if your looking for a light for your Kindle.