Quality lies in the details, create excellent products with heart. Selection of high-quality aluminium alloy material, beautiful and practical, high hardness, not easy to deformation, not easy to rust in the humid environment, anti-aging, anti-corrosion. The middle section can be screwed open, waterproof compartment inside, cm can store some notes and other small items, can be used as outdoor survival, training, with a keychain, easy to carry. Measuring 2.9*0.43 inches, this custom outdoor high decibel 2 section whistle. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Customization: Logo printing available with multiple packaging and color options. Product Highlights: Portable, durable, practical for daily use.