The information about the product is provided by the seller. Notwithstanding any of this information, the product is not intended for diagnosis, cure, mitigation, treatment or prevention of any disease, is not a drug or a medical device, and should not be used for any medical purposes. Please consult a medical specialist. This product has pulse function, there will be microcurrent, and it is normal to have a tingling feeling TENS pulse massage: low-frequency pulsed electromagnetic current is conducted to the skin, and by activating the cells of the human body, prevent pain caused by muscle stiffness. 42 heat care: like a hot towel on your shoulders and neck, innovative hot compression temperature setting10. 15-speed intensity adjustment, 6 head massage: precisely cover the 4th peripheral cervical spine massage, only cover the cervical spine common pain area. Material: ABS Number of massage gears: 15 gears Charging time: about 1 hour Massage temperature: 42C Rated power: 3w Voltage: 3.7V Current: 1A