It's impossible to tell the output of a laser just by it's beam or dot. Most cheap "5mW" pens output around 25mW-50mW though, so be careful.
Looks like a lot of smoke in the room.
No one can guess the power of a laser. There are so many variables involved its impossible to get a good reading by looking at it.
What you can do is see if it will burn through a black plastic garbage bag. If it can it will be over 50mW. If it can light a blackened match its over 75mW. If it cant do either its anywhere between 10-50mW. In any event its not 5mW so be very careful where you point it. All it takes is a millisecond to burn your eye.
Well it's ruined so I'm looking for a replacement. I forgot it in my car the other day and now the divergence is insane.
The dot is around 6 inches at 10 ft.