What electronic accessory item emits blue light at one end of it?
I’m not sure if it is one it just looks like it. It looks like a pen from a distance, it is metalic, cylindrical, and it was found on a freezing cold day in the snow. It was emitting blue light and it went off in the warmth. What is it? There is no on and off button.
This question is in the General Section. Responses must be helpful and on-topic.