switch died (edit)
Was working great until the control buttons died and made it an unlit desk magnifier. Useless, no way to contact seller for warranty or exchanges.<br />(EDIT)<br />It was not a problem with the switch, my usb ports on my computer were low voltage so if the light goes out check with a phone charger to make sure it is an issue with the light, not your power source.
Rating: 4 stars