Answer:

microphones, thermometers & loudspeakers

Explanation:

An article from "whatis.techtarget.com" ; "A transducer is an electronic device that converts energy from one form to another. Common examples include microphones, loudspeakers, thermometers, position and pressure sensors, and antenna. Although not generally thought of as transducers, photocells, LEDs (light-emitting diodes), and even common light bulbs are transducers."

"What is transducer? - Definition from WhatIs.com" https://whatis.techtarget.com/definition/transducer?amp=1