The electronic whistle operates with a push of a button instead of blowing like a traditional whistle. Yet sounds nearly the same as what you're used to. Point the whistle toward the target area and press the button.
You can hold the button down for as long as you need the electronic whistle to sound.
And you won't run out of breath from doing so!
This electronic whistle has many uses including lifeguards, referees, umpires, tour guides, sport trainers, cheerleaders, traffic cops, police, military training, dog handers, or even as an emergency locator (earthquakes, collapsed buildings.)
Pocket clip lets you clip in a pocket or on a purse. Hygenic-others can use it too.
4 inches long and operates on four LR44 or AG13 batteries. Batteries are included