Super Loud Survival Whistle: Double-barrel emergency whistle, powerful dual-chamber high-pitched sounder that delivers up to 120 decibels of sound power, enough to be heard a mile away. Don't blow too much, use it as a signaling whistle. Flawless design means no moving parts, no blocking sounds, nothing blocking interference, breaking or freezing. Lightweight and unbreakable, the magnificent whistle works well in all conditions, with excellent airflow design. Comfortable grip, does not stick to lips like metal in a cold environment. Adjustable reflective lanyard and clip for high visibility even in the dark, with sliding button to adjust neck length, long lanyard can easily pass through backpacks, sailboats, gear hiking camping, life jackets, PFD leather boat, paddle board, bike. You can also attach the whistle to a belt or shoulder strap for quick and easy use in an emergency. Super durable high impact ABS plastic construction ensures high durability and is completely waterproof and moisture resistant. High quality whistle, suitable for outdoor activities such as life safety, camping, hiking, backpacking, hunting, archery, fishing, swimming, boating, kayaking , sporting events at sea, as well as for dog training. Convenient service, worry-free warranty and lifetime support included with every purchase. If you have any questions, our friendly customer service team will be happy to help you.