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Emergency whistle signals Emergency Whistles Lifeguard Safety Whistle With Lanyard And Keychain For Outdoor Camping Hiking Boating Hunting Fishing   specification Material: Aviation Aluminum Alloy Size: 5.6*1.5*0.8cm Feature Ultra-loud lifeguard whistle: The double-pipe emergency whistle can provide up to 120 decibels of sound, which is enough to be heard at a long distance. High quality: [...]