Posted by a reviewer on Amazon

The fox 40 is the only whistle any official should take on a football field

Posted by a reviewer on Amazon

Besides the above pro the con of this classic whistle is it sounds very loud with a hipich tone pears through your ears with quite uncomfortable

Posted by a reviewer on Amazon

On the other handsthe fox40no moving parts has only a small one part only whistle with a super thin and flat belly with two very small airchannels on the rear of the mouth piece to let the air passes through and a little hole undeneath behind it to let the small amount of air to escapes to create the hipitch sound and this kind of noise sometimes hurting my ears and i seldom use this whistle because its bother the enimals and it scares the sht out of my lovely cat

Posted by a reviewer on Amazon

You may use this whistle effectively in a less noisy places such as in the school playrounds with some white noises but its useless in an instruction zone with some heavy construction noises

Posted by a reviewer on Amazon

The red whistle named storm is the worlds loudest moving parts loudest sound whistleand its really deafening your ears when it is blown

Posted by a reviewer on Amazon

Everything pros out of this whistle and the only one thing con is it is not loud enough if there is a storm coming in an oceanthis whistle might not be heard and your rescuers can not be reached

Posted by a reviewer on Amazon

The whistle is a little too loud to use for our archery range as up close the whistle genuinely hurts my ears

Posted by a reviewer on Amazon

The logo says x2 but there is only one set of whistlelanyard in the package