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Bose QuietComfort 25 with mounted 3.5 mm headphone jack, and carry case. The "QuietComfort 25" (QC25) over-ear headphones were released in 2014 [47] as the replacement for the QuietComfort 15, and sold until 2019. Unlike its predecessors, the QC25s can be used (without the noise cancelling function) while the battery is dead.
In 2021, Bose released the Bose QuietComfort 45 headphones. This model introduced USB-C support for more convenient and faster charging. Bose also added a fourth external microphone to enhance call quality and integrated Bluetooth 5.1 to improve wireless range and connection stability.
The headphones themselves are noticeably smaller than the original version — 30% smaller, to be exact — and the charging case is 40% smaller. The QuietComfort II earbuds, which are available ...
Bose store in Century City Bose store at the Hong Kong International Airport. The company was founded in Massachusetts in 1964 by Amar Bose with angel investor funding, including Amar's thesis advisor and professor, Y. W. Lee. [9] Bose's interest in speaker systems had begun in 1956 when he purchased an audio system and was disappointed with its performance. [10]
Loss of potency requires periodic replacement of the source in radiotherapy and is one reason why cobalt machines have been largely replaced by linear accelerators in modern radiation therapy. [175] Cobalt-57 (Co-57 or 57 Co) is a cobalt radioisotope most often used in medical tests, as a radiolabel for vitamin B 12 uptake, and for the ...
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