Using the Stadler Form Eva WiFi Ultrasonic Humidifier is a breeze. First, fill the water tank with clean water. You can choose to use the water pre - heating function if you want a warm mist. Next, decide on your desired humidity level between 30% and 75%, and select one of the five output levels. You can control these settings manually or let the auto mode do the work for you using the Adaptive Humidity™ technology. If you have the external humidity sensor, place it in the area where you want to measure the humidity. The sensor can also be used as a remote control. To use the Wi - Fi feature, connect the humidifier to your home network and use the smartphone app to monitor air quality and control all functions. For the scent feature, add your favorite scent to the designated area. When it comes to maintenance, make sure to clean the water tank regularly to prevent the growth of bacteria. If you're not using the humidifier for a long time, empty the water tank completely. And remember, this product is covered by a 30 - day return policy in case you're not satisfied.