Whistle
For whom?
Referees, life guards, lost hikers, police, Von Trapp patriarchs, dog trainers, ’90s ravers, malevolent children.
How?
A stream of compressed air creates sound as it passes through the body of the whistle, amplified by the pea-like ball inside. Or, in other words: you just put your lips together and blow.
And
Need to be heard urgently over a mile away? Under five and hate your parents? Here’s your answer.
HEALTH
PLEASURE
More Mouth
