Hi Guys! First post here. I am looking for a laser pointer for outdoor use. I do a lot of back-country skiing, so I would like something I can take with me to point out mountains and stars. Also, in an emergency situation, it would be nice as a signaling device if I ever needed to get a helicopter or another person's attention (at night). I have a few questions for you guys. First, does the ambient temperature mater? Do these handheld lasers have a problem operating in below freezing temperatures? Also, what about waterproofing? There does not seem to be a lot of waterproof lasers out there. I would like to be able to drop it in the snow without issue. From what I am reading here, it seems 100mw would be enough for my needs. Would also prefer continuous use. Any recommendations? Thanks so much!