A whistle is great aid to enhance recall. It can be used by anyone. In a panic it shows no emotions. It carries sound a long way.  The pattent pending Recall Hoodie Whistle easily threads on to your favorite hoodie. This hoddie wistle also works as a cord stopper. This non metalic whistle has been tested in extreme conditions. Will not freeze to your lips. Works everytime. Comes with easy to follow steps to master a strong recall.