The all in one Coghlan's Six Function Survival Whistle packs an entire survival kit into a small package. Conveniently clips to your pack or jacket, so it's always there when you need it. Wt: 2.2 oz 62.4 g Sizes: 3 x 1 x1 plastic The Coghlan's Six Function Survival Whistle includes: The perfect light when you need your hands free. L.E.D. light. Compass. Magnifier Thermometer Signal mirror. Whistle. Convenient lanyard with clip. Batteries included. Uses 3 SR1120 x 1.5v batteries, Energizer 391 batteries or NEXXTECH 2300107 batteries. Import.