Batteries included?:No Features:1. Made of high-grade material, which is durable, safe, non-toxic and eco-friendly.2. With great sound penetration, can easy to whistle and make a loud, clear sound.3. Dolphin shape design, more fashion and lovely.4. Lightweight design, comes with a lanyard, easy and convenient for you to use.5. Suitable for outdoor survival, life-saving, PE lesson, and basketball or football game.Specifications:Material: ABSColor: Light Blue, Black, Grey, Dark Blue (Optional)Size: 6 * 2.5 * 1.8cm / 2.4 * 0.98 * 0.71inchPackage Weight: approx. 26gQuantity: 1pcPackage Included:1 x whistle1 x lanyard1 x teeth guard [Dolphin Shape Design]: The referee whistle is dolphin shape design, more fashion and lovely [Great Sound Penetration]: With great sound penetration, can easy to whistle and make a loud, clear sound [With a Lanyard]: Lightweight design, comes with a lanyard, easy and convenient for you to use [High-grade Material]: Made of high-grade material, which is durable, safe, non-toxic and eco-friendly [Suitable for]: Suitable for outdoor survival, life-saving, PE lesson, and basketball or football game [Dolphin Shape Design]: The referee whistle is dolphin shape design, more fashion and lovely [Great Sound Penetration]: With great sound penetration, can easy to whistle and make a loud, clear sound [With a Lanyard]: Lightweight design, comes with a lanyard, easy and convenient for you to use [High-grade Material]: Made of high-grade material, which is durable, safe, non-toxic and eco-friendly [Suitable for]: Suitable for outdoor survival, life-saving, PE lesson, and basketball or football game