Metal Police Whistle

They're shrill, they're high-pitched, and some people may just call them annoying for it, but they're also necessary all over the place for those exact reasons. Need a car to stop in its tracks at a cross-walk? What about getting the attention of a bunch of athletes over the din of a screaming crowd? Heck even lifeguards use them to get everyone out of the pool from time to time and everyone knows that the metal ones work the best.

That's why it's crucial to add onto any costume. This real, working metal whistle is perfect for anything from an officer of the law to a referee costume. Just remember that it's quite a responsibility wielding this wherever you go. Use it too little and everybody will do whatever they want but if you use it too many times you might just be forced to sit on the bench yourself.