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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 use of encryption devices occurs during the Presentation layer of the OSI Model as it is the responsibility of this layer to encrypt data. Cable A cable is a device which is used during the first layer of OSI Model. The purpose of a cable is to connect two devices. Note that there is no interaction of data with the cable and it is merely a device to establish a connection.