Before first use, it is necessary to fully charge the device for approximately 3 hours. It is important to remove the protective plastics from the electrodes, clean the electrodes, and slightly moisten the neck to ensure good contact; if the electrodes are not in contact with the skin, the device will not function correctly. It is recommended to remove necklaces or other metal accessories that may interfere with contact. Pregnant, breastfeeding, or menstruating women should not use this product, nor should individuals with acute diseases, infections, malignant tumors, tuberculosis, heart conditions, or blood clots; users with metallic implants in their bodies, or individuals taking medication that affects blood clotting. This is not a medical device and should only be used as indicated in the manufacturer's manual. After each use, it is advisable to turn off the device and clean it with a soft, slightly damp cloth, avoiding aggressive products. Optimal operating conditions are between 5 °C and 40 °C and humidity up to 85%. The user must carefully read the safety precautions included in the downloadable documentation before use.