feature High frequency mute: noise reduction design, 0-20 decibels, very quiet, almost no sound Lightweight and comfortable: light and thin, more comfortable to wear Full silicone brace: softer, less pressure, suitable for neck size Micro-surface design: ergonomically designed to fit the skin surface Soft silicone inner arm pad: skin-friendly soft silicone inner arm pad Strong battery life: built-in lithium battery, USB charging, one charge, 30 minutes of daily use, sustainable use for 15 days, long battery life. Low-frequency pulsed electromagnetic currents are conducted to the skin to prevent soreness caused by muscle stiffness by activating body cells. People who should not use this product 1. Those who are receiving disease treatment or have obvious physical discomfort, please consult a doctor before use 2. Take good care of children and make sure they do not play with this product. 3. The surface of the product is hot, people who are not sensitive to heat must pay attention when using it. 4. Patients with allergies, heart disease and other people with electronic devices in the body should use it with caution 5. This product is not intended for use by anyone, including children who are physically, sensory or mentally impaired, or who lack 6. Relevant experience and knowledge