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2. List of discontinued Bose headphones - Wikipedia

   en.wikipedia.org/wiki/List_of_discontinued_Bose...

   Unlike its predecessors, the QC25s can be used (without the noise cancelling function) while the battery is dead. Another change is the elimination of the Hi/Low switch which increased the input gain for low-output sources like MP3 players. In 2015, the QC25s won the What Hi-Fi? Sound and Vision annual award for "Best Noise Cancelling Headphones".

3. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Electronic microphones, circuitry, and receivers perform active noise reduction, also known as noise-cancelling, in which a signal that is 180-degrees out-of-phase of the noise is presented, which in theory cancels the noise. [1] A U.S. Soldier wearing a hearing protection and communications headset.

4. List of Bose headphones - Wikipedia

   en.wikipedia.org/wiki/List_of_Bose_headphones

   The headset features improved noise-cancellation compared to the predecessor QuietComfort (QC) 20, coupled with a noise canceling microphone in the right headphone. It received CNET's Editors' Choice Award or 8.4/10 points for its active noise-cancelling. [24]

5. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   A Bluetooth earbud, an earphone and microphone that communicates with a cellphone using the Bluetooth protocol. Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs).

6. List of Bluetooth protocols - Wikipedia

   en.wikipedia.org/wiki/List_of_Bluetooth_protocols

   The Bluetooth protocol RFCOMM is a simple set of transport protocols, made on top of the L2CAP protocol, providing emulated RS-232 serial ports (up to sixty simultaneous connections to a Bluetooth device at a time). The protocol is based on the ETSI standard TS 07.10.

7. Prime Day 2021: Best tech deals right now - AOL

   www.aol.com/news/prime-day-2021-best-tech...

   Prime Day is here and so are thousands of tech deals on headphones, laptops, smart home devices and more across Amazon and other retailers. Prime Day 2021: Best tech deals right now Skip to main ...