... , contusion, parenchyma strain. Intermidiate Frequency Electric Interference InstrumentTreatment Theory:Intermediate Frequency Electric Interference Instrument can generate low-frequency interference endogenous current to restrain ... osteoarthritis.Main technical parameters:1. Working frequency: 4000Hz.2. Beat frequency range: 0 ~ ±180Hz.3. Low-frequency modulation range: 0 ~ 220Hz, adjust step ...