Survival Whistle,Rigtee Aluminum Alloy Rescue Whistle With Neck Lanyard And Keyring Outdoor Emergency Survival Coach Whistles Referee Gear Lifeguard Loud Double Tubes Whistle (Blue)The Rigtee Aluminum alloy survival whistles mainly for outdoor emergencies,For example: you and your teammates got separated,or when you need help.You can use it in all ..