Acme 888 Cyclone is the most user friendly whistle.  Features a modulated sound without sacrificing loudness or control, pealess, 119dBA. The 888 Cyclone is a dual passage design producing low and high frequency sound. Idea for smaller grounds like soccer and hockey or indoor sports like basketball or volleyball.

119dba

Blow rate required 2

Blow sound 5

Blow tone 2