The 7-in-1 Safety Whistle sets 7 functions including Emergency Whistle, Compass, Thermometer, LED Signal Light, Magnifying Glass, Reflector and Sealed Warehouse with good playability. Emergency Whistle is made of ABS high strength, fall resistance and high temperature engineering material, lightweight and fail-safe nice whistle works well in any conditions with excellent airflow design. This survival whistle comes with a long enough lanyard, which can be tied to your backpack, belt or neck.