By definition, the whistle is an acoustic generator which has no moving parts - possibly vibrating - which convert a stream of gas or liquid to the energy of acoustic vibrations. From a practical point of view, this accessory is used in all conditions, regardless of occupation, place of work or the form of active recreation. Successfully used by coaches, travelers, instructors, law enforcement or tourists. Made of both metal and plastic material. We invite you to read the offer !

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