Loudest Survival Emergency Whistle - Necklace Aluminum Whistle Key Chain for Emergency Hiking Camping Survival, 3pcs with Red/Green/Blue Color Loud whistle, good for sporting events, camping & hiking, boating. A must- have for outdoor adventure lovers. A Loud whistle can be heard for far distance. Will save your life in dangerous situations. Assorted colors available: Red, Green and Blue. Material:Aluminum. The anodic oxide coating guarantees the fastness and the long using life. Light and easy to take out. With a key ring.