People respond to the sound of a siren. Now you can get someone's attention in a hurry with this hand crank siren. It may look small but don't be fooled ' this powerful tool emits a signal that is audible up to 1/4 mile away, making it a great choice for schools, golf courses or calling in the cowboys for chow time. Manual operation; doesn't require electricity to operate.People respond to the sound of a siren. Now you can get someone's attention in a hurry with this hand crank siren. It may look small but don't be fooled ' this powerful tool emits a signal that is audible up to 1/4 mile away, making it a great choice for schools, golf courses or calling in the cowboys for chow time. Manual operation; doesn't require electricity to operate.