aluminum alloy outdoor dual-frequency whistle outdoor mountaineering outdoor survival whistle equipment 铝合金户外双频口哨户外登山野外求生 哨子装备

Material: Hard aluminum material
Color: Silver, gold, black, customizable
Surface treatment: Hard oxidation
Specifications: Length 56mm * Width 15mm * Thickness 8mm
Packaging: OPP bag
Boxed: 2000 per box
Weight: 10g
Features:

1. Unique whistle design; the overall style is innovative, high-frequency, and loud when blown lightly.
2. The double-hole design produces a sound level of 80–120 decibels, ensuring its performance remains effective even in harsh environments.
3. Made of aluminum alloy, safe, high performance—exhibits a rugged outdoor style.
4. A carefully designed cut design enables air vibrations to produce higher-frequency sounds that can travel farther.
5. Compatible with keychains, lightweight, easy to carry and use.