Safety first. The Zipper Pull Whistle is the perfect emergency whistle for you or you college student. Built to remain low profile enough to go unnoticed when not needed and loud enough to draw attention when in a bind. With the ability to attach to a key ring, lanyard or the zipper pull hole on college back pack, purse or coat, it’s easy to keep this whistle within an arm’s reach. Pack of 3 so you can attach in three different places. Built to last. By Chums.