There are two modes on XMAX V3 PRO---SESSION Mode and ON DEMAND Mode.
When using the device for the first time, the default mode is SESSION Mode. In this mode, the device will begin to heat up to the default temperature after it is turned on. Besides, the working time will only start counting down after the device reaches the specified temperature.
If you want to switch to the ON DEMAND Mode, just need to click the “+” button and the “-” button together one time. Then hold the power button until the device reaches the specified temperature and you have done with every inhalation.