aluminum alloy outdoor dual-frequency whistle outdoor mountaineering outdoor survival whistle equipment

Material: Hard Aluminum Alloy
Color: Silver, Gold, Black, Customizable
Surface treatment: hard oxidation
Specification: Length 56mm * Width 15mm * Thickness 8mm
Packing: OPP Bag
Case Pack: 2000/case
Weight: 10g
Function:

1. Personality whistle design, the overall style is novel with high-frequency high pitch, easy to blow and loud.
2. The dual-hole design can emit sound levels of 80-120 dB, ensuring performance even in harsh environments.
3. Aluminum alloy material, safety, high performance, overall reflects a tough outdoor style.
4. Carefully designed incision allows for higher air vibration, resulting in a more powerful and louder sound, capable of reaching farther.
5. Compatible with key chains, lightweight, convenient to carry and use.