6 kinds of massage modes material inside: polystyrene styrofoam particle 2*AA Battery( not included) - Update: 2009-10-20

1.improve head and neck blood circulation 2.increase the oxygen supply for brain 3.relax muscle through massage to release neuropathic pain,tiredness and paralysis 4.Prevent cervical vertebrea disease according with body physiological - Update: 2009-10-20

1.improve head and neck blood circulation 2.increase the oxygen supply for brain 3.relax muscle through massage to release neuropathic pain,tiredness and paralysis 5.Prevent cervical vertebrea disease according with body physiological - Update: 2009-10-20