Whistles, Stainless Steel Sports Loud Crisp Sound Whistles with Lanyard,Whistles Great for Referees, Coaches 1、Product introduction: it contains 48 whistles, which are suitable for coaches,referees, trainers and traffic police. 2、Loud sound, the sound is very clear, can reach 120 dB. 3、high-quality materials, which are safe and firm, and can be used for a long time. 4、Each whistle is equipped with a braided rope for ease of use and non discarding. 5、widely uses; It is suitable for school physical training, football, basketball, football and other projects.