For the 40K fat burner/cavitation head, we usually recommend using it 2–3 times per week on the same area, with at least 48 hours between sessions. Each session can be around 10–15 minutes per treatment area, and we do not recommend staying too long on one spot. Please keep the probe moving during use and always use gel or a water-based medium. For RF tightening heads, you can also start with 5–10 minutes per area, depending on your skin sensitivity. Start from a low level first and gradually increase only if it feels comfortable.