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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.
The main purpose is to grab people's attention. Once it has achieved that purpose, its next purpose is usually to provide people with information. Sometimes posters are designed to make people curious about something, and encourage them to seek out further information of their own accord. TouchScreen Â· 7 years ago.