Coghlan's Four Function Whistle uincludes a whistle, 2-scale Thermometer, Magnifier and compass and a spring loaded clip for attachment to belt or lanyard.
- A screaching loud whistle
- Compass, Magnifier and 2 scale Thermometer included
- Spring loaded clip for attaching whistle to belt, etc., or for keys
- Meets Canadian standards for boating which require a pealess whistle