40k cavitation operates at a frequency of 40,000 times/second. 80k can emit twice as many ultrasonic waves. The 80K cavitation weight loss machine works at a higher frequency than the 40K cavitation machine, the noise is smaller, and the probe can generate heat. The choice of cavitation frequency depends on the desired treatment effect and the fat thickness of the area to be treated. But 40k low frequency ultrasound is more suitable for dissolving deep and stubborn fat.