1. emergency whistle: The package contains 12 aluminium emergency whistles, including 6 different colours (red, silver, blue, black, green, yellow), with a size of 1.81 × 0.33 inches, and each signal whistle also comes with a key ring for easy transport, which is very easy to grip and blow in an emergency. 2. Emergency defense whistle: When you are out and about, the whistle can help you confirm the direction, avoid getting lost, find companions, etc. If someone is lost, robbed, needs a taxi or in case of emergencies such as an earthquake, a flood, a fire, etc., you can use the whistle to make a loud sound to attract helpers. 3. Loud Whistle: The outdoor survival signal whistle can make a loud and bright sound, which can be heard from a long distance, very suitable for various emergency situations. In daily life, the loud sound of the emergency whistle can also easily attract the attention of others. 4. Sturdy and durable: These aluminium bird whistles are made of aluminium alloy and metal key ring. The material is durable and nontoxic, not easy to crack, fade or corrode, double anodized. The lightweight design of this outdoor survival signal whistle allows it to be worn comfortably around your neck or hung on the equipment without feeling bulky or annoying.