Windsor 8303 Single Tone Electronic Whistle. It's the Sound of a Whistle . . . at the Push of a Button! The sound is loud and consistent every time, even if user is short of breath or injured. Perfect for use as a personal safety device for hikers, campers, senior citizens, joggers, and anyone else that could benefit from carrying a whistle. The electronic whistle is also a more sanitary option being hand operated allowing multiple people to use one device.