Generally it's a two person team to handle long range shots, one takes account of the environmental factors and converts them into usable data for the shooter. While it has been mentioned, this device adds light, at night time that would be a bad thing - during the day it wouldn't be a problem.
As far as music is concerned, they wouldn't hear - they'd be lucky to hear the report from the gun before they got hit...
@Philip Marquis: Surprisingly, competitive shooting is a sport. It's even an Olympic sport. As this does calculations, it is a calculating app. It's only "violent" when ignorant people label it as such, b/c they deem all guns "bad".
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As far as music is concerned, they wouldn't hear - they'd be lucky to hear the report from the gun before they got hit...
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but this gits approved..
OK THEN
i wonder if you can make a smoothy out of it
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But hey, enjoy yourself while you can.