Gradually increase the energy level until you feel a light tingling sensation, as this varies among individuals and may change day by day. Adjust the level during the session: increase if the sensation fades and decrease if it becomes too intense. The right level is when you feel the tingling without pain or discomfort in your tragus. If irritation occurs, shorten the stimulation time rather than lowering the energy level to ensure therapeutic effectiveness. As long as you feel the sensation without pain, you're using Nurosym correctly.