Multi Frequency Survival Whistle: This emergency whistle is designed to emit high, medium, and low frequency distress signals. The low frequency sound is powerful and can be heard at close range even in noisy environments. The high pitched sound effectively attracts attention, making it suitable for emergency or alarm situations. Clear and Loud Sound: With a crisp and loud sound that carries over long distances, this emergency whistle is useful for calling for help or gathering companions in outdoor survival scenarios. Convenient to Carry: This survival whistle can be easily attached to tents, equipment, water bottles, backpacks, key rings, and other accessories, making it a practical tool for various outdoor adventures. Versatile Use: Made of durable plastic material that resists wear and tear, this outdoor safety whistle is suitable for activities such as camping, hiking, fishing, or traveling. Product Specifications: The package includes 10 multi frequency survival whistles. Each whistle measures 7 cm x 2.7 cm x 0.7 cm (2.76 in x 1.06 in x 0.28 in). Size Chart: 7 cm x 2.7 cm x 0.7 cm (2.76 in x 1.06 in x 0.28 in) Package Includes: 10 Outdoor Survival Whistles Note: Please allow slight variations of 1–2 cm due to manual measurement.