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.
Since 1964, the company has led tech innovation in all things audio, including televisions, theater systems, speakers and of course, headphones. Though the first set of Bose noise-cancelling headphones â put to market in 1989 â were too big for consumer application, they were widely used in the aviation industry. But decades of innovation have yielded headphones with improved design and performance, which have found a comfortable home in the consumer market.