1. Piezoelectric buzzers are more widely used. 

Regarding the applicable scope, buzzers can be used in many such products, such as gas alarms, security alarms, vehicle speed alarms, navigation systems, in-vehicle audio equipment and automobiles. They can also be used in various household appliances, such as air conditioners, microwave ovens, computer control systems, toys, teaching aids, etc. 

2. Can produce louder sounds 

Since the piezoelectric buzzer is controlled by an electronic circuit, it can produce various types of simulated sounds and loud noises, including intermittent sounds. Pure tones and noise cannot be easily suppressed. 

3. Can save electricity 

Piezoelectric buzzers are voltage-driven, so they consume less current, typically less than 20 milliamperes and less than 100 milliamperes. 

In addition to the above three advantages, the piezoelectric buzzer does not generate arcs or RF noise, has no interference with other circuits, and can produce sounds with controllable frequencies. This can be achieved by the level effect of the scale. In some special cases, LEDs can be reused and the control ports can also be utilized.