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Since version 1.1 Bluetooth devices can transmit voice calls and play several music and video formats, but audio will not be played in stereo unless the cell phone or media device, and the headset, both have the A2DP profile.
For example, when you use a mobile phone with a Bluetooth headset, the phone uses SDP to determine which Bluetooth profiles the headset can use (Headset Profile, Hands Free Profile (HFP), Advanced Audio Distribution Profile (A2DP) etc.) and the protocol multiplexer settings needed for the phone to connect to the headset using each of them.
For example, plugging TRRS headphones into a TRS headset socket, a TRS headset into a TRRS socket, or plugging TRRS headphones from one manufacturer into a TRRS socket from another may not function correctly, or at all. Mono audio will usually work, but stereo audio or the microphone may not work, or the pause/play controls may be inactive, as ...
One downside is that the Eargo 7 doesn't have Bluetooth connectivity for streaming audio. Still, its automatic sound technology adapts to each environment — transitioning between music, phone ...
The Audio/Video Remote Control Profile (AVRCP) is often used in conjunction with A2DP for remote control on devices such as headphones, car audio systems, or stand-alone speaker units. These systems often also implement Headset (HSP) or Hands-Free (HFP) profiles for telephone calls, which may be used separately.
Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...
Bluetooth: Yes, 1.2; Profiles supported: Basic Printing, Generic Access, Serial Port, Dial-up Networking, Headset, Handsfree, Generic Object Exchange, Object Push, File Transfer, Basic Imaging, SIM Access, and Human Interface Device Infrared: Yes (The Infrared feature was missing from the Nokia N70 and due to demand it was put back onto the N80)
It can also be used to Bluetooth connect audio to pretty much any device with a standard 3.5 millimeter headphone jack. Use it on airplanes to connect AirPods to in-flight entertainment, at gyms ...