2pc Lifesaving Whistle, Waterproof Outdoor Emergency Loud High Decibel Keyring Double Tube Stainless Steel Signal Double High-quality materialsMade of high quality stainless steel,not easy to rust, not easy to be broken,durable, you can use it for a long time. Widely usedThis lifesaving whistle is a great tool for outdoor activities, like camping, fishing, hiking, hunting, life-saving in emergency. Also suitable for Coaches, Referee, Football Coach, Basketball, Soccer, Hockey, Lifeguard, etc. High decibelDouble tube design, it is easily blown softly so that just the blast out a loud tone.Double tubes can provide up to 150 decibels that pitch crisp sound can be heard far distance. You can save 30% energy than normal whistle,if you get separated from the group while hiking. Unique designEmergency whistle, it can be used in all-environment all-weather, rainy day, humid weather with excellent airflow design, easy to whistle and make clear and maximum sound. size5.8*1.8cm. weight24g*1. colorblackgoldsilvercolorful. pack*2.