Classic Official - Fox 40's first patented 3-chamber whistle, designed to be heard above crowd noise. Used by referees and coaches at every level and NOW demanded by Law Enforcement Departments and Traffic Control Personnel. 115 decibels of power ensures every call will be heard! • 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