Transmitters and receptors of the message usually involve only hearing.

Transmitters

In a biological context, substances like neurotransmitters that transmit nerve impulses across synapses. In technology, devices that send signals or data.

Receptors

Biological molecules or structures which bind to specific substances, allowing them to have an effect within an organism, or components in technology designed to receive signals.

Hearing

Hearing is the sensory process that involves the perception of sound waves through the ears, enabling individuals to recognize and interpret sounds in their environment.