Windsor Electronic Whistle Single-Tone<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Loud， consistent sound every time</li><li>Easier to give verbal commands without a whistle in the user's mouth</li><li>Each set of AAA batteries produce more than 1000 blasts</li><li>Loud 105db whistle sound can be aimed in the exact direction intended</li><li>Improve hygiene - hand operated instead of mouth blown， sanitary for multiple people</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41riPvfPZEL.jpg" noproxy>