If you have any questions about the product, please feel free to contact us directly via email (open "Your Account" on Amazon - find "Your Order" - find your this order - click "Contact Seller ") or through the after-sales service mailbox provided in the instructions for a 100% satisfactory solution. Kindly Notice 1. Please DO NOT use this device with other medical electronic machine together. Such as cardiac pacemaker, Artificial heart and lung, electrocardiograph etc. DO NOT use both high frequency surgical equipment and this product simultaneously on your body, otherwise the electrode parts of the product may cause burns or damage the product. DO NOT use this product near short wave or microwave treatment equipment(1 meter), otherwise the output of the product may not be stable. 2. If people who are Pregnant, sensitive skin, heart disease, abnormal blood pressure, malignant tumors, cerebrovascular patients, acute disease, or being treated, please consult your doctor before using this device. 3. Do not use in bath or sleep. 4. Do not use for children. 5. Do not use for patients who are skin sensory impairment or heat insensitive. 6. Please turn off the device before adjusting position or removing device to other places. 7. Please adjust pulse intensity gradually as your need. 8. Please do not disassemble this device; Avoid collision and water. 9. Do not wash this device with water. 10.As the neck skin is sensitive, we recommend not to use neck massager continuously for a long time, preferably 2~3 times a day, 15 minutes each time.