Mega Horn Set of 3 Mini Noise Makers - LOUD! - For Parties, Sports, Personal Alarm. SET OF THREE : Set of 3 loud, attention getting wide-trumpet air horns. ATTACHE : It is attached to a 36" nylon lanyard so you can wear it around your neck or hang in a spot where it might likely be needed. TAKE ONE along when you are out walking or jogging alone for an added feeling of security. USE : Use it to scare away wild animals, prowlers, or anything else that you don't want hanging around. SIZE : Measuring just four inches long and 1 1/2" in diameter, this handy little noise maker can be heard up to a mile away.