It states CLEARLY to do not have it on in A Certain temperature or else it will not work like how you want it to. I've had my wasteland green laser for months now and it has been working perfectly like I want it to. When I need my husband I would shine the laser on him just to tell him what I have to and this is how mobile it comes in for me. I do not have to shout across the room just to talk to him Because a lot of times he would be wearing his headphones Usually with his music extremely loud.
Yes I use mine as a form of communication with my husband.