120+ decibels of high pitch shrill rises above ambient noise and can be heard over a mile away * 100% constructed of high-impact ABS plastic-So they"re 100% impervious to Moisture * Pealess Design, No moving Parts-nothing to obstruct Sound, nothing to jam, break or freeze * Ideal for large Crowd Areas such as Football Stadiums, Motorsport Race Tracks, Airport Runways, Construction Sites and any Situation where a very loud Signalling Devise is needed * Fox 40 cannot be overblown-the harder you blow, the louder the Sound