Acme Tornado Slimline Whistle

There are a few things I like about this whistle. It's loud, and I mean loud. as in 117dbs loud. It has more than one frequency - two high pitch frequencies for loudness close to the whistle and a lower pitch for distance, and they all sound simultaneously. It's also small (2" x 1" x 1") and very lightweight so you can pack it just about anywhere. It's a great little whistle at an excellent price.