Slim Rescue Howler Whistler.

Slim Rescue Howler Whistler. The Slim Rescue Howler weighs only a few grams, but it packs a big punch - namely, a 100dB signal that is audible from over a mile away. The pea-less design means this whistle works in all conditions and will never jam or freeze. Be Heard: 100dB whistle signal is audible over one mile. Fail-Safe: Pea-less design works in all conditions - won't freeze or stick to lips w