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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.
Using a headset frees your hands to do other things, especially useful when you are driving because many states now have laws limiting talking on the phone while driving. There are many different styles of Bluetooth headsets available on the market and most of them work well with the iPhone.