What does the "circle button" do?
The circle button is used to:
• Turn on the display (once the power switch is on) to see charge level and status.
• Toggle the laptop output voltage between 12, 16 and 19V by pressing it quickly.
• Initiates power flow to the USB charging ports
• Turn on or off the flashlight by pressing the button for 2 seconds. (subsequent quick presses will toggle the 3 light modes)