● G240N/G320N: The item’s default setting is set to not turn off by itself. You may change it yourself by pressing the function keys, the power key, and the LED light key simultaneously, and then releasing the LED light key immediately, the display will flash one time, and the product will automatically turn off within 3 minutes. If you carry out the above operation again, the display will flash twice, and the product will not turn off by itself anymore. ● GT500/GT1200: These products will shut down automatically if not used for eight hours. Please remember that the AC output will automatically switch off within 5 minutes without load.