The world's highest recorded surface temperature is 56.7 Â°C (134 Â°F) measured at Greenland Ranch in Death Valley, California, USA on July 10, 1913. The mean temperature in Dallol, Ethiopia is 34.4 Â°C (94 Â°F), the highest annual average temperature on earth.
The Wave System III is made in Columbia South Carolina. The Bose A20 and A20 Bluetooth headsets are made in the United States. The US made Bluetooth Headphones they provide are the the most advanced BoseÂ® aviation headset yet, and they are still US made. The A20Â® Aviation Headset is used primarily in the aviation industry.
While the headphones offer a nice way to escape the chaos and immerse oneself in hi-fidelity audio, that's not the reason they were invented. But it did start with airplanes. On a flight home from Zurich in 1978, Dr. Amar Bose tried an early set of electronic headphones that were newly onboard for passenger entertainment; try because he could barely hear anything with the overwhelming cabin noise.