Loud and Crisp: The Sound of The Whistle Is Loud, Crisp and Clear Which Can Carry A Long Distance, You Can Catch attention Quickly, and The Sound Wont Hurt Your Ears When You Blow The Whistle. . Upgraded Design: The Whistles Are Equipped with An Adjustable Bead Which Can Fix The Length of The Lanyard, This Can Prevent The Whistle from Missing When You Are Doing The Exercise. . Colorful Whistles: The Pack Acsergery Giftage Includes 7 Plastic Whistles and 1 Metal Whistle, Various Kinds of Colors Can Fulfill Your Different Needs and Preferences for Use, It Is More Economical. . Free for Hands: Each Whistle Comes with A Lanyard, You Can Hang The Whistle Easily Around Your Neck Or On Wall When You Dont Need to Use It, It Is More Convenient for Daily Use. . Widely Application: These Whistles Are Suitable for Referees, Coaches, Instructors, Sports, Teachers, Survival, Emergency, Training Bird Or Dog and So On. .