| Matrix Survival Whistle w/ Integrated Compass & Thermometer Features: A must have for all emergency kits and outdoor activities Built in Thermometer used to measure temperature Built in Compass to indicate direction of travel Lanyard included to keep it securely around your neck or tied to the kit Water resistant Dimension: 9.8cm x 2.8cm Weight: 42g Color: Green Material: Durable High Impact ABS |