Neck Massager Homedic's NWT Vibration 2 settings with heat

Neck Massager Homedic's NWT Vibration has 2 settings with heat for pain relief. ADAPTER OR BATTERY OPERATED VIBRATION OPERATES ON INCLUDED AC ADAPTER OR 4 AA BATTERIES (NOT INCLUDED). FOR VIBRATION PLUS HEAT, USE THE AC ADAPTER Massager Heating Pad Neck Massager Pain Relief It was a gift never used.