How to choose an ultrasonic cavity machine. A single interface is inconvenient to use. 2 interface can avoid frequent replacement. There is a base to use more convenient, can avoid the handle scratch. Ultrasonic cavitation using 40K brand ultrasonic, more powerful energy, stable output. Small size ultrasonic cavitation thrust is not enough, weight loss effect is not good. The handle should choose surface fuel injection treatment, with color light, and a larger power handle. To select multi-language versions that can be adjusted.