Built in clip for PFDs that do not have pockets. Use your whistle for emergency by blowing it three times loudly. Use your whistle to get the attention (non-emergency) of your paddling buddies by blowing once. Note: Tie your whistle to your PFD. It will float, but whistles are best stowed and tied into a PFD pocket if possible. Whistle cord must be long enough to reach your mouth. You can tie off to the shoulder strap if needed. Do Not tie to the zipper, it can catch & un-zip! The advantage of the Basic Whistle is that it has a clip, no pocket needed and it costs less than the Storm Whistle, but is not as loud. Related Article: Signal Devices