There are a total of 4 buttons on the main unit. The power button controls the power on and off of the vibration mode. The "+" and "_" buttons control the strength of the vibration mode. The vibration mode is divided into 5 positions. The third position is the default when the machine is turned on. The sun button controls the red, blue, and hot compress functions. In any state, press the sun button once to turn on the red light and hot compress functions, press the second blue to turn on the hot compress functions, and press the third red, blue, and hot compress functions to turn them off. The vibration mode, red, blue, and hot compress functions can be turned on at the same time or work independently. When each mode is turned on, it will automatically turn off after 10 minutes of work by default.