THE ORIGINAL – The Sun Company TripleWhistle is the original 3-in-1 compass/thermometer/whistle, designed and final-assembled in the USA. LUMINOUS COMPASS – 20mm Grade A liquid-filled compass is luminous so it can be easily read in low-light conditions. JAPANESE DIAL THERMOMETER -Features an extremely accurate 20mm liquid-damped Grade AA dial thermometer that reads down to a chilly -20 degrees Fahrenheit. LANYARD – Wear TripleWhistle around your neck or easily attach to your pack or parka