This knee massager has three heating modes - low, medium, and high temperatures. The low temperature is set at 105 °F, the medium temperature at 122 °F, and the high temperature can reach up to 140 °F. The heat is evenly distributed to cover the entire knee area. For this massage knee, long press the button to start or end the work. Short press the mode button to cycle through the modes (Auto - Low - High - Off), the indicator light will turn white when it is on. Short press the heating button to cycle through the heating temperatures (Low-Medium-High-Off), the indicator light will turn white when on. knee massager made of high-quality material. The strength of the massager can be adjusted according to the pressure applied. It also can enhance the relaxation during the massage process, so that the knees can get an all-around soothing massage. Allowing your knee enjoy an all-around comfortable massage, fully release the pressure.