1. Use it for sports game referees, practice coaches, gymnastics, marching, cheering, dog training, police, security, traffic control, disaster relief, SOS, etc.
2. The whistle will be heard for as long as you press the screen.
1. The louder the sound, the more realistic it feels.It works, it's just annoying that when I swipe up to close the app it keeps whistling until I swipe it awayNo full screen disruptive ads like the other blue whistle app.
2. This just has minor banner ads which I can deal with.Performs as expected! Adjustable volume.
3. Sound and response are good.
4. Can sound in small increments.
5. PerfectExactly what it says it is.....a loud whistle.