I sit at the computer all day and was looking for a ring light that doesn't blind me and doesn't have to be attached to my surface because I need it to be mobile. I also don't have much room on my desk for a floor lamp. I attached this to the wall behind my computer and can regulate the brightness (so as not to become blind) and heat. It took me a while to figure out how to turn on the light, but I did it. Costs money. Supplied with short cable c. I have several for my phone so I used the longer one to connect to a charging source.