The SHARX features a 4-resonator body that emits an unbelievably powerful 120db dual-frequency signal. A true outdoor whistle, the ABS plastic body is co-molded with rubber inserts for grip and comfort during use. Fail-safe pea-less design works in all conditions - won't freeze or stick to lips when cold. Intense Howl 4-resotor body with dual frequency tone produces piercing sound with minimal effort. Whistle can be heard from over a mile (1.5 km) distance. The whistle measures 2.4" x 1" x .75" (6.1 x 2.5 x 2 cm), weighs 0.6 oz. (17 g) and is ideal for skiing, snowboarding, hiking, backpacking, alpine and rock climbing, mountain and road biking, hunting and fishing, off road activities, paddle sports and emergency prep. Whistle comes with a Corrosion Resistant Stainless Steel Split Ring for attachment to a Lanyard or Clip.