If you need a siren whistle, these loud little mini air blaster horn whistles are for you! They function extremely well as a rescue whistle also.

You don't even have to blow this compact pocket whistle...just push a button. Emits a loud 120db whistle for as long as you push the button. Useful in various situations such as sporting events, a locater in emergencies (earthquakes, collapsed buildings), referee whistle, traffic use for police, military training, dog handling and as a safety alarm for crime prevention.

4 inches long.

Uses 4 LR44 batteries (included).