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Bluetooth is a standard wire-replacement communications protocol primarily designed for low power consumption, with a short range based on low-cost transceiver microchips in each device.
A Bluetooth profile is a specification regarding an aspect of Bluetooth-based wireless communication between devices. It resides on top of the Bluetooth Core Specification and (optionally) additional protocols.
The "QuietComfort 35" (QC35) over-ear wireless headphones were sold from 2016 until 2018, as a Bluetooth headset based on the QuietComfort 25 model. The QC35s could be used without Bluetooth as wired headphones, and the right earcup included volume controls and a play/pause button.
Apple has a program to service batteries and purchase replacement individual AirPods and charging cases. The replacement of one or both AirPods or the charging case has a lower price with AppleCare+ than without. Apple offers battery servicing for free with AppleCare+ and for a fee without.
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In Bluetooth devices with simple functionality (e.g., headsets), the host stack and controller can be implemented on the same microprocessor. In this case the HCI is optional, although often implemented as an internal software interface.