Basically, they are a very low powered LED light attached to a small clip. Their packaging claims that they will burn for 24 hours. They turn on with a simple twist and stay lit until you twist them again. These small lights weigh almost nothing, much less than an ounce I would guess. They come in red or white. I chose white, although in retrospect red may have been a better choice for hunting.
I can think of two uses for these.
My first thought was to use them as a means to locate my gear at night. Who hasn't lost or misplaced gear at night? A few weeks ago I left my stand at dusk to track a deer I shot. By the time I found and took care of the deer night had fallen. Finding my stand in the dark was a real bugger. Had I clipped one of these lights to my stand, I would have found it quickly. You could clip them to just about anything you need to leave behind. A knife lanyard, jacket, backpack, or even a truck or ATV, the list is endless. They are cheap enough that you can carry and use several without breaking the bank.
After playing with them I discovered that they are also perfect for very close lighting in pitch darkness. These do not cast very much light, but when you are setting up a stand you do not want much light. No hunter wants to broadcast his position everywhere. These are bright enough to get the job done, but not so bright to bring attention. Don't get me wrong, they are not bright enough to navigate with. You cannot see more than a few feet with them. But they are perfect for checking the time, loading a gun, or finding something you dropped.
I'm not sure if every Lowes carries them, but you can purchase them from Amazon from the links below. They would make a great stocking stuffer. I can't wait to try them on my hunt this weekend!