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no difference between brands etc. no features beyond on or off. Green laser is all you need to look for. The one Greg was using on the show you are ignoring the fact it was humid there so LOTS of moisture in the air for the photons to bounce off (light itself IS invisible after all) plus as they demonstrated you were watching them through a low light camera that amplified the effect, its not that bright in person. Plus of course they are not toys and of course can be see miles away so if you're in a suburban area the police can see where the laser line is pointed from.
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