Coghlan"s Four-Function Whistle: * Includes magnifier, 2-scale thermometer and compass * Comes prepared with convenient quick-attach clip to secure it to a belt, lanyard, etc. * Can be used across many activites, sports and for general safety * Perfect for boaters, lifeguards, scuba divers, campers, hikers, skiers and sports fanatics * Essential for outdoorsman and sportsman alike * An invaluable lifeline for the stranded