Fox 40 Micro Pealess Whistle 110 dB 2 Pack w/ Lanyards - Blue/Orange The Fox 40 Micro is designed to be small and flat with no pressure points Can be attached to anything - life jackets, clothing, backpacks, etc. Recommended choice by outdoor enthusiasts, adventure guides, runners, hikers and cyclists No moving parts to freeze, jam or deteriorate Flawless, consistent and reliable The harder you blow, the louder the sound Easy to blow and cannot be overblown Chambers are designed to self-clear when submerged in water Will be heard above ambient noise, loud crowds, the roar of engines, breaking waves and thundering gale-force winds 2-Pack with 2 Breakaway Lanyards Design: 3-chamber pealess Sound Power: 110 dB