The mobile phone is iOS system, and install VOCOlinc App (Multi-system mode)
2. On the mobile phone, open Settings->Notifications->select VOCOlinc, click to enable "Allow Notifications", and set the reminder method
3. Reset the VHI and use the VOCOlinc App to add devices
4. After the addition is complete, click the VHI device icon on the Home page to enter the Humidifier details, switch to the Settings page, and click to enable "Empty Tank Alert"
5. When the VHI device detects water shortage, the mobile phone will receive a "No Water" notification