Question about Bose QuietComfort

The noise cancellation feature on Bose QuietComfort headphones, including the QC45, does not function in the same way when using a cable as it does with Bluetooth.

When you use the headphones with a cable, the active noise cancellation (ANC) is not enabled. This is because ANC requires the headphones' internal electronics to be active, which is not the case when they are connected via a cable. Instead, you might experience passive noise reduction due to the physical design of the headphones, but the active noise cancellation will not be active.

To adjust the volume when using the headphones with a cable, you need to use the volume controls on the headphones themselves, as the volume buttons on the headphones can still function even when connected via a cable, although this may require holding the buttons for a few seconds to adjust the volume to the desired level.