The lamp serves its purpose and is in particular to the price okay. I had not noticed when ordering on the dimensions and then amazed when unpacking something that you almost as long in angeklemmtem state is like the reader shell itself But still nice and light and that was the real reason of the order:. Button cell and therefore lighter than My previous clamp lamp that is powered by one AAA battery. Something lighter it is, but the screen is not completely illuminated (what works for the other lamp), but only in the middle and on both sides it is then dark. While it is sufficient supposedly first reading, but could possibly over a longer period but are hard on the eyes. I use them as a reserve.