Radio frequency skin tightening (RF) is an aesthetic technique that uses RF energy to heat tissue and stimulate subdermal collagen production in order to reduce the appearance of fine lines and loose skin. … By manipulating skin cooling during treatment, RF can also be used for heating and reduction of fat.
Cavitation 
Ultrasound Fat Cavitation Therapy Is Natural. Fat cavitation therapy uses low-level ultrasonic waves to break your fat cells down into a liquid while leaving surrounding tissues intact. Once the fat cells have liquefied, they’re eliminated from your system using your body’s own natural elimination processes.