Product name: whistle Product size about :9*4.7cm/3.54*1.85in Product color: As shown in the figure Product material: Aluminum alloy product features: 1. The aluminum alloy material has a solid surface. Imagine that the whistle can still be used after being squeezed by a heavy object when encountering difficulties. The outdoor emergency survival whistle is a must-have for any outdoor enthusiast. Its compact and lightweight design makes it easy to carry and use in emergencies. 2. Dual-frequency function, which can emit high and low sounds, making it easier to attract attention in different environments. This makes it a versatile tool for signaling distress or communicating with others in a variety of outdoor scenarios. 3. The whistle's high volume output ensures it can be heard from a distance, increasing the chance of discovery by rescue teams or others nearby. 4. The whistle comes with a convenient keychain that easily attaches to a backpack, belt loop, or other gear for quick and easy use. This ensures it's always within reach when you need it most. 5. In emergencies where communication signals are crucial, the outdoor emergency survival dual-frequency whistle provides a reliable and effective means of attracting attention and increases the chance of rescue. Its durable construction and practical design make it a must-have tool for anyone adventuring in the great outdoors. Precautions: 1. As we all know, different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you find it difficult to choose the size, you can contact us at any time. We will give you some suggestions but for your reference only. Shipment includes: 1 pc whistle