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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.
The Ultra model also includes Bluetooth 5.3, providing a more stable connection and lower latency. Additionally, the battery life has been extended, offering up to 28 hours of playback on a single charge. Similar to the QuietComfort 45, the battery is not user-replaceable.
When I tried the Bose Ultra Open Earbuds ($299) for the first time, I was ready to cut down on my headphone lineup. ... The only downside is that it can drain your battery, so use this feature ...
Ultralife Corporation designs and manufactures batteries and communications systems worldwide. [4] Ultralife serves government and defense, medical, safety and security, energy, robotics and other customers across the globe through the design and development of a range of products.