Fox 40 Classic Official Whistle with Break Away Lanyard 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