The high-frequency dual chamber resonance whistle is a common outdoor supply, it is small and easy to carry. Good for use when out camping, hiking, traveling, fishing, hunting, boating, etc.SpecificationColor: GoldMaterial: Aluminum AlloySize: 56 x 15 x 8 mm/2.2 x 0.59 x 0.31 inch (L*W*H)Weight: 39.6gPacking List: 4 x Camping Whistles with KeyringAdvantage1. Made of aluminum alloy material ensures the whistle is strong and durable.2. The surface is anodized for color formation, which is not easy to fade, exquisite, and beautiful.3. Lightweight enough. With a keyring, portable and easy to carry.4. The double tube whistle is blowing easily, providing a louder and clearer sound, that can be heard from a far distance.5. No moving parts, water-resistance, that can use at all-environment all weather.