Swimrunners orange lightweight emergency whistle emits a shrieking, high-pitched sound. The whistle can be used either with a lanyard or clipped directly onto your belt or wetsuit. The finger grip area makes the whistle easier to hold with cold hands. The whistle is waterproof and durable. The design won't rust, clog, or freeze and works in all weather conditions. Swimrunners whistle in polypropylene construction is a non-corroding whistle which will float in sea water.