This neck massager with heat works awesome, just put it on your neck, and turn on the switch, and you can choose the heat you like. But you need to make sure the electrodes are close to the skin of the cervical spine. Also, it's safety, it will stop on it's own after 15 minutes of use. So neck can't get hurt. Neck Massager with Heated has several different modes and intensity levels and a heating function that will improve blood circulation, relieve muscle fatigue , Highly recommend it!