So here you're installing a mosquito device outside of your venue? A device that produces constant noize pollution in a common street? I can surely see how somebody should complain to police, and they surely should confiscate that device and write you a fine. It's strange if that would not happen.
Also:
> ...a group of teenagers have taken to hanging out outside your store...
There's some kind of weird narrative here, because I've never heard things like this happening where I live. Not once.
> The teenagers end up playing football or skating or something, not intimidating people
Why won't they do that in a first place? If they also enjoy destroying bins and drawing gravity they can surely do that in ten minutes or so, doing all the damage and avoiding too much nuisance from your device? I can't imagine teenagers hanging in one place all the time, won't that be extremelly boring?