304 food-grade Stainless Steel: Non rusting, non fading, sturdy and durable. Whistles need to enter the mouth and safe materials need to be selected
Three Tube Resonance: High volume whistle, with a maximum volume of up to 130 decibels. A great helper for wilderness exploration and calling for help to survive
45 ¡Æ Sound Cutting Vent: More easily blown, The sound is clearer and louder and allows for longer sound transmission distance
Ball-free Design: The sound chamber is not afraid of dirt and water ingress, and can still perform well even in various harsh environments
Easy to Carry: Comes with a 1 inch key ring for easy portability and easy access at any time
