S.O.L. Survive Outdoors Longer Slim Rescue Howler Whistle (2-Count), Orange, Model:AD0010

Amazon.com Price:  $10.01 (as of 02/01/2024 10:52 PST- Details) & FREE Shipping.

Emitting a piercing 100-decibel signal, this slim single-frequency whistle is audible from over a mile away.
Pea-less design ensures that the whistle works in any outdoor conditions without jamming or freezing.
Weighing less than an ounce, this ultra-portable whistle fits in any pocket and attaches to zipper pulls.