The service life can reach 5-6 years, which is more durable and practical. Its built-in chip has been approved by American patent, which helps to receive and forward EMFs energy around the body, thus restoring the original EMFs balance of the human body, improving your health and maintaining the best state. It's quite personalized. After wearing it, stick to the skin. For the first time, you can feel a slight numbness in your fingertips, and then the part attached to the bracelet is slightly hot. Hands that have been worn for a long time do have a higher body temperature, which is not obvious.