Led Pen

How can I use an LED light pen?
Sounds silly, but I have a LED light pen today, and when I try to use the LED light does not work. Does anyone have this problem? It sounds silly, but I have a LED light pen today, and when I try to use the LED light does not work. Does anyone have this problem? It has a button, but when pressed, does not work. It also has a laser, which also works, so it can not be that the battery is dead.
dead battery
Led Pen
Led Pen











