Features Color:black Size: 49-51cm Packing: opp bag Hyperthermia with natural mineral tourmaline as the core, comprising the product formed integrally with the nano-bio-functional materials. In the case of temperature and pressure changes, continuous release of far infrared, negative ions. And the thermoelectric micro-current stimulation effects to the human body. Can effectively improve blood circulation, ease muscle fatigue, activation of cell metabolism, dredge the meridians, to wind and dampness, pain to the cold, and enhance the body's resistance to disease. Products are safe, easy to use, lasting effect. Use Note: 1, the correct use of this product is: first with a wet towel to wipe the neck close to the skin side, and then wear to the neck, so that heat faster. If you do not use this method, it is normal that there is no fever or slow fever. Please do not ask for a refund or a bad review on this basis. Thank you. 2, this product may be hot when the heat you can not stand, feeling hot, this is normal, do not think it is skin allergies, you can not stand to take it off, and then wear it again. The good medicine bitter mouth is good for disease, thank you! Package: 1Pcs Tourmaline Neck Massager Belt