External microphone designs have the microphone housed in the front end of the microphone arm. The microphone arm of headsets may carry an external microphone or be of the voice tube type. Telephone headsets are monaural, even for double-earpiece designs, because telephone offers only single-channel input and output. Single-earpiece headsets free up one ear, allowing better awareness of surroundings. Double-earpiece headsets may support stereo sound or use the same monaural audio channel for both ears. Headsets are available in single-earpiece and double-earpiece designs. Stereo computer headsets, on the other hand, use 32-ohm speakers with a broader frequency range. Telephone headsets generally use 150-ohm loudspeakers with a narrower frequency range than those also used for entertainment. 4.1 Digital Enhanced Cordless Telecommunications.
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