What are the advantages of piezoelectric buzzers

1，Piezoelectric buzzers are more widely used
  In terms of the scope of use, this kind of buzzer can be used in the following products, such as gas alarm, burglar alarm, speed alarm, navigator, car audio and car equipment, but also can be used in various household appliances, such as air conditioning, microwave oven, microcomputer control, toys, teaching appliances.
2，It can make more sounds
 Because the piezoelectric buzzer is controlled by electronic circuits, it can produce a variety of pleasant sounds and analog sound, intermittent sound. Pure timbre, not easily covered by noise.
3，It saves power
 Piezoelectric buzzer is driven by voltage, so the current consumption is small, generally under 20mA, not more than 100mA.