Perko Marine Safety Whistle made of high-impact orange plastic, perfect for attachment to life vest or around the neck as a signal whistle. Simply blow into the whistle and let yourself be heard in need of emergency. This safety or distress whistle conforms to A.B.Y.C Standard A-23 in accordance with the 72 COLREGS and USCG rules for use on vessels under 16.4 ft in length.