16 massage Nodes Massager: Hlthsky Shiatsu back massager with 16 massage nodes, 2 vibration motors. It allows you to adjust heat Settings, the direction of rotation of the roller, kneading strength and vibration patterns to create a personalized and effective massage experience. These functions can be used alone or in combination. Heat and Vibration Aid Recovery: The electric massager has 2 built-in heating areas, allowing you to enjoy soothing heat on your neck and back simultaneously. The heating function of our back neck and shoulder massager has been upgraded to 3 levels of low, medium and high, which you can adjust at will to make it more suitable for you, very comfortable and useful. And preset automatically shut down after 30 minutes to prevent overuse.