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A headset combines a headphone with a microphone. Headsets are made with either a(n) single-earpiece or a(n) double-earpiece (mono to both ears or stereo). Headsets provide the equivalent functionality of a telephone handset but with handsfree operation.
This is not to say that a Bluetooth 1.1 headset, for example, will not work with a Bluetooth 2.0 phone - it will. It is only to say that in order to enjoy the benefits of Bluetooth 2.0's features, such as faster connection times, a Bluetooth 2.0 (or later) headset would have to be used. Also known as: 802.15.1.