![]() Both of them are older than A2DP, and were initially designed to pass telephone-quality sound (2-directional mono sound, limited frequency response, optimized for speech only). The "Hands-free" device corresponds, respectively, to either the "Hands-Free Profile" (HFP) or "Headset Profile" (HSP). It is optimized for transferring 2-channel stereo sound with good quality in one direction only. The "Stereo" device is technically known in Bluetooth jargon as "Advanced Audio Distribution Profile", or with an acronym A2DP. ![]()
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