just a note, your auction states its a 5MW (mega-watt or million watts) it is a 5mW (mili-watts or 1/1000 of a watt) which is a big difference. a normal red pen laser is 1/2 a mW or less, so the green laser is still very bright, enough that even a brief flash directly into the eyes will do permanent damage even if its not noticed. i bought one of these and enjoyed it enough to buy 3 more. (overkill i know)