Good Day. Thank you for your question.RADIO FREQUENCY is an energy used in medical for decades and can ablate tissue (used in shrinking and killing cancer masses), kill muscle (as my partners at Stanford University got FDA approved to shrink the tongue in sleep apnea and increase the airway size), and can result in Skin Tightening.In my clinical practice, Venus Viva being a RF device, if increased overall energy is applied, can result in skin tightening. The clinical indications is pigment improvement, skin resurfacing and skin tightening.However, the amount of skin tightening that can be attained, may not be satisfactory to achieve an acceptable aesthetic outcome. Subcutaneous volume and skin excess and laxity are direct components if the treatment will yield patient satisfaction.Our clinical treatment protocol uses the maximum energy levels with 3-5 passes during each session. With these energy levels, skin tightening can occur.Mild skin tightening can result in satisfactory neck aesthetic result, while more significant excess and inelastic skin may require internal ultrasound (VASER), RF (Thermi) or laser (Alma 1740 nm internal laser probe) or a neck lift alone or associated with a facelift.In summary, Venus Viva RF Can result in skin tightening.with maximum energy levels. Best of luck!