The whistle was invented by 19th century British toolmaker Joseph Hudson.
 It was created for referee signals in soccer matches and has since become popular.
 Ferrocerium alloy was discovered in 1903 by Carl Auer von Welsbach.
 It was invented by an inventor named and is still used today for emergency camping, survival, etc.
 This BYTAL™ module has dual functions: whistle/igniter.
 The whistle can be adjusted in volume.
 It can be used to promise various signals in case of emergency.
 The lighter can be used by opening the slide lid and quickly scraping the ferrocerium stick through the lid.
 Ferrocerium sticks are sharply ground into small pieces by friction with metal.
 It oxidizes and generates heat of over 2000 degrees.
 Use it like flint to light the spark of survival.