This mini police siren attaches to your phone, allowing you to film your own Naked Gun-style intros. It would attach via suction cups or a clamp, allowing it to be oriented in portrait or landscape mode.
Why not make this a Snapchat filter? It would look better to see what you’re filming reflect off the police car and the chrome of the siren, for that authentic look.
Dave's Geeky Ideas 
This is perhaps the greatest thing you have ever posted.
I want one of these for my GoPro!!
Oh Hell YES
This is the greatest invention ever.
So can I buy this yet? Found it while googling for one.
It’s just a design, sorry.