Two rectangular boxes with two arrows placed in between. The top arrow points right, the bottom to the left.
Left box is labelled ‘Sender (Speaker/writer)’
Right box is labelled ‘Receiver (Listener/reader)’
Top arrow is labelled ‘Message’ and points from ‘Sender’ to ‘Receiver’
Bottom arrow is labelled ‘Feedback’ and points from ‘Receiver’ to ‘Sender’.