An output device that uses words or messages recorded on a magnetic medium to produce an audio response is a

A voice response unit produces an audio reply from words recorded on a magnetic medium.

Magnetic tape is a storage medium, not the output device that speaks the response.

A voice recognition unit does the reverse, converting spoken input into data.

Voice band refers to a range of audio frequencies, not an output device.

The unit selects and plays stored spoken messages on demand.

Telephone enquiry and announcement systems commonly use such units.