An instrument that produces musical tones by means of oscillating electric circuits; such as, a theremin, a musical instrument with electronic tone generation, the pitch and tone volume being controlled by the distance between the player's hands and two metal rods serving as antennas or it is also defined more simply as, an electronic musical instrument, played by moving one's hands through electromagnetic fields created by two metal rods.

1. A buzzing or clicking sound in the back of the head which is experienced by someone who is subjected to pulsed microwave radiation; such as, from a skull to voice instrument. 2. The sensation of hearing which is produced when an alternating current of suitable frequency and magnitude is passed through an animal or human body.
3. Audible clicks induced by pulsed or modulated microwave frequencies.

The clicks are generated directly inside the human head without the need of any receiving electronic device.