USE FOR:- EMERGENCIES- REFEREE- COACHES- TRAVELERS- TOUR GUIDES- CHEERING- LIFEGUARDS- TRAFFIC ENFORCERS- DOG TRAINERSMULTI-FUNCTION ELECTRONIC WHISTLE - In the wild whistle is not only the role of whistling collection, but also the role of lifesaving! Awesome high volume electronic whistle for P.E. teachers, coaches referees, sports training, outdoor camping, electronic dog whistle for training, hiking SOS survival emergency.Easy to get attention, loud, consistent sound every time. Electric whistle helps your voice at recess without blowing but also send louder, strong and consistent sound compared with traditional whistles.