Sound-producing device using piezoelectric material.

Speaker designed for very low-frequency sound.

Erasable programmable read-only memory.

Sensor detecting nearby objects or users.

Electronic circuit driving a speaker.

Speaker enclosure element that resonates without a voice coil.

Programmable read-only memory that is normally programmed once.

Sensor measuring acceleration and movement.

Hardware converting between analog and digital audio.

Read-only memory programmed during manufacturing.