Piezo speakers and piezo sensors are commonly us in foodservice equipment. Piezo speakers are limited and usually serve as notification or reminder buzzers. A piezoelectric sensor is a device that measures changes in pressure, acceleration, temperature, strain, or force by converting them to an electrical charge. Piezo ignition is a type of ignition that is used in gas grills. Piezo ignition uses the principle of piezoelectricity, which is the electric charge that accumulates in some materials in response to high pressure.