Follow these steps to configure your valve so that it closes during a power failure or when the batteries are low:
Login to your Neviweb account.
Go to the Device List page by tapping the middle icon at the bottom of the app.
Select your Wi-Fi smart water valve (VA4220WF/VA4221WF).
Go to the Settings section.
Go to the Configuration section, then select the required action when batteries are low: No action, Close valve if power failure or Close valve. Save.