Fox 40 Mini Finger Grip Whistle Shrillest penetrating power, Fox 40's patented pealess design is the whistle of choice Fail - safe design eliminates the pea, creating a high-pitched penetrating, omni-directional sound No moveable parts to jam, break or freeze, Mini size with fingergrip 109 decibels - The harder you blow, the louder the sound First choice of sports organizations worldwide - including the NFL, NCAA, NBA, CFL FIBA and FIFA