The magnetotherapeutic device of Hebei Telephone Machinery Factory can be worn on the wrist for 3 years. Magnetic therapy is a simple and effective scientific method to treat some diseases by using artificial magnetic field (external magnetic field) to act on meridians, acupoints and diseased parts of human body, including oral and external magnetic drugs. It is suitable for cervical spondylosis such as hyperosteogeny of cervical vertebra, degeneration of cervical intervertebral disc, change of physiological curve of cervical vertebra, spinal stenosis, cervical vertebra type, nerve root type, vertebral artery type and spinal cord type. Periarthritis of shoulder, arm pain, numbness of fingers, dizziness, tinnitus, hypertension, insomnia, stiff neck, blurred vision, unstable walking, stiff neck muscles, tinnitus, weakness of limbs, etc. Reduce snoring, improve sleep comfort, prevent head and neck diseases, and maintain a healthy head and neck sleep state. After nearly forty years of practice and research, the application of magnetic field in medical treatment in China has the following characteristics. Extensive signs. Good curative effect. Time saving and convenient. Treat both diseases. Two-way treatment effect. No pain, no damage and good safety. Magnetic therapy belt is a clever use of magnetic therapy.