Bluetooth for headsets is mono (the HSP & HFP profiles). Stereo bluetooth uses the A2DP profile. This is designed for music & stereo headsets. Note: note all cell phones support stereo bluetooth. Next generation bluetooth: This appears to be what som...
The in ear noise headsets can do more damange if the volume is up louder due to the fact it is closer to your ear drum... but really that is with any headset and the volume you select. Noise Cancelling headsets really do help isolate noise around you...
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