Function: 1.Inlaying permanent magnets 2.Smooth the nerve system 3.Promote blood circulation 4.Remit the neck/waist/knees’ pain & cold 5.Help to cure cervical vertebra disease 6.Without using of electricity & spontaneous heating 7.Safe and convenient to use 8.Obvious effects for keeping health How to use : 1. Use wet cloth to wipe the heat part of neck/waist/knees massager before you wear them on. You will feel obvious heating on the neck/waist/knees after about 15-30 minutes. It takes longer time if you do not make the heating parts wet. 2. It’s a re-use product and can be used for very long time. 3. Just wash by hand. No need any soap. 4. Scorching hot is normal phenomenon when you first use this product. Just take off the massager, the scorching hot will disappear later. 2-3 times every day and 3 hours each time is more beneficial to your health.