115 Decibels of high pitch shrill rises above ambient noise-can be heard up to 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 * First Choice of; NFL, NCAA, NBA, CFL FIBA and FIFA * Fox 40 cannot be overblown-the harder you blow, the louder the sound