a loud whistle, made from a toughened plastic material, the safety whistle is an essential part of any outdoor or mountain survival kit. a whistle can be used to alert people if you are in distress. the internationally recognised distress signal is 6 blasts of the whistle with a 1 minute break and then repeated. the reply is 3 blasts with the same pause. loudness: 108 db. Emergency whistle, Toughened Plastic, 108Db