Size:Length: 2.75 inches / 7cm, Width: 0.78 inches / 2cmPackage Includes: One package contains 10 pieces safety whistle with lanyard it's suitable for team and individual use.Quality Whistles: This set of emergency whistle is made of good quality plastic, very lightweight, waterproof and durable. Double tube designeach whistle can produce high and low frequency sounds.Conspicuous Colors: These whistles are designed to be visibly orange, very bright, which can attract others' attention outside, help you to be found easily .Special Design: The whistles with lanyard are designed with a clip and a nylon cord for securing on your belt or life jacket.The length of the cord can be adjusted freely. It's convenient to hang on the neck and wrist wherever you want.Easy to Use: These safety whistles are easy to let out high-pitched sound which is can be heard from a long distance, also can be applied in sailing, hiking, boating, kayaking,camping, hunting,emergency survival, rescue and so on.