Features: 1. High decibel whistle, personalized whistle design, novel overall design, high-frequency treble, easy to blow. 2. Dual-hole with a strong sound and dual-hole design can produce 80-120 dB, even in a harsh environment, can also play its performance. 3. Alloy material, aluminum alloy material, safety, high performance, the overall embodiment of the hard outdoor style. 4. Incision design, meticulous incision design, so that the air vibration is more frequent, the sound is a more loud, more far-reaching transmission. 5. Keyring design, lightweight, easy to carry, more convenient to use. 6. High-frequency double-tube whistle is a good assistant for outdoor appliances. It is compact and easy to carry, can also be used for water intake."
