Stay prepared for the unexpected by keeping the Survive Outdoors Longer Slim Rescue Howler Whistle - 2pk in your pocket. Each whistle weighs less than an ounce but can be heard over one mile away. Its sound is over 100dB so anyone in range will be able to hear and identify it. Take a whistle with you in all outdoor conditions, the fail-safe pea-less design will not jam or freeze in cold temperatures. Stay safe and prepared when you travel outdoor with a Slim Rescue Howler Whistle.