This is a whistle designed for today. There is no need to put mouth to device as it is completely electronic. As you can tell from the photo, there are 3 distinct tones and 3 volume levels (120db to 150db). It comes complete with a neck lanyard, a storage bag, and batteries. Believe me, it is VERY LOUD. It can be used in athletic events, hiking and other outdoor activities, only limited by your imagination. It is powered by 3 AAA batteries (included).
https://www.amazon.com/gp/product/B08Y5CDPCD #Yukee #Electronic #Whistle #Coach #Referee #Emergency