Essential survival tool: The whistle is equipped with a built-in thermometer and a direction reference, enabling you to read current temperature and determine direction quickly. Magnifying glass: When the whistle cannot be used, use the sun reflection principle to search for rescuers and indicate your location; when there is no fire in the wild, use the magnifying glass attached to the survival whistle to refract sunlight onto grass blades to start a fire. High decibel: Standard high decibel survival whistle with a high-frequency, powerful sound generator, providing up to 120 decibels of sound, audible up to a mile away, helping you be found in an emergency. High quality: Small and elegant with an excellent airflow design. Includes a keychain so you can attach it to a backpack, belt, or key. Use scenarios: - On hiking or mountain trips: monitor temperature and orientation to inform clothing choices and navigation, while staying ready to signal if needed. - In camping or wilderness survival: use the magnifying glass to signal rescuers or to start a fire when other methods aren’t available. - In emergencies: rely on the 120 decibel whistle to attract attention from rescuers over long distances.