Just like the larger sternum strap version this little safety whistle serves multiple purposes and may just help keep you or your kids found. Add to all of your Jackets and your kid's Jackets, pack zippers, anyplace you need a great zipper pull. Always have a signal whistle at hand and easy to get to on your gear. Super loud! And small enough to not weigh you down at only 5 grams with the included pull cord. Make sure the kids know how and when to use a signal whistle.