SOL Slim Rescue Howler WhistleEmitting 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. These whistles are ideal for signaling for a variety of outdoor activities, whether you are on the trail, on the slope, the water, and