A device used in telecommunication that converts electrical signals into sound, allowing a user to hear the voice of the person on the other end of the line. It is typically held to the ear during a conversation.

The component of a telephone or radio that facilitates listening, often integrated with a transmitter, where incoming audio signals are transformed for human hearing.

An essential part of a telephone system designed to capture and translate audio from electrical energy, specifically used by the listener to perceive spoken communication.