Unlock/indicator light
During operation, the VENTURI TM power supply device will automatically lock 1 min after the last button operation to prevent the vacuum level from being adjusted unintentionally, and "L" will be displayed on the display screen.
The TM power supply device of the Venturi tube will automatically lock one minute after the button (the button marked with "L" on the display screen) is pressed for the last time to prevent the vacuum pressure from being adjusted unintentionally.
Press and hold the unlock button, and the power supply unit will automatically lock again 1 min after the last button operation.
Press the unlock button, and the power supply unit will automatically lock one minute after the next button is pressed.
If the power supply unit is in the battery running state, pressing this button will also light up the display screen 10 second (the display screen will always light up in the power running state).
If battery power is used, after pressing this button, the display will only display 10 seconds (the display will always be on during main operation).