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 Heard100dB whistle signal is audible over one mile.Fail-safePea-less design works in all conditions – won’t freeze or stick to lips when cold.Take it EverywhereUltra-portable design weighs only a few grams and fits in any pocket – or attach it to a zipper pull.