The Slim Rescue Howler(TM) 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. FEATURES & BENEFITS > 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 when cold. > Take it Everywhere Ultra-portable design weighs only a few grams and fits in any pocket - or attach it to a zipper pull. KIT DETAILS Package Size: .875" x 2.25" x .3125" Package Weight: .2 oz. ea. Group Size: N/A Trip Duration: N/A