2.Heating function improve the blood circulation; 

3 buttons for your different choice; 

4.With Libattery inside, cordless design; 

5.Small size make it easy to use indoor and outdoor; 

6.Super light weight; 

7.Wrap the back of the brain, fit the back of the neck; 

8.Fit the head and neck curve, not back to the head; 

9.No squeezing on both sides to protect the face; 

10.Relax neck skin and relieve neck pain;