Used one for a night light with it plugged into my charger's USB port.
Using a USB extension cord I mounted the light on the ceiling above my desk and received just the right amount of light.
These will be great on camping\hiking trips where light of any kind is at a premium, the minuscule power used was unable to drop my 10,000 mAh power bank's charge indicator lights even a single level even after 14 hours of continuous use.
Simple; does what it says it will do - lights up my keyboard .
They are bright and they work great .
This does not get in the way of typing and gives plenty of light.
I gave one to a friend and she really likes hers too.
The metal in the groove on the top can get quite hot, but the rubber is raised around it so you are not likely to touch it--just hold onto the neck of the light.Well, here it is just a little over 2 months later and my light will not work and is very loose in the slot.
I opened my third light and plugged it in and that did not work at all--brand new never touched!!
I am very disappointed.