Switching between manual and automatic modes：Press and hold the circular button in the middle of the body to switch between manual and automatic modes. The long white light below the round button will flashes/stands still when switching.
Switching between Single and Dual-Pulse mode:Press and hold both the power buttons on the sides of the body and the circular button in the middle together to switch between single and Dual-Pulse mode.At this point, the blue light will illuminate.
At this time, you can adjust the intensity by pressing the side power button.