The manufacturing technology of pepper balls has been based on ultrasonic technology since its appearance. Although the pepper balls produced by ultrasonic technology can be used, the pepper balls produced by ultrasonic technology also have many disadvantages, such as low accuracy, burrs at the welding joints, etc.

The biggest disadvantage of ultrasonic pepper balls is that they will burst in the transmitter, causing hidden dangers to use, and the ultrasonic pepper balls will not be tightly sealed at the welding joint, which is easy to absorb moisture, resulting in the problem of short storage time.