This 2 USB port boasting car charger cum humidifier serves 2 purposes at once, charging 2 of your devices at once, and striking a balance between dryness and moisture in your car. If you want to simply set the humid aura, fill the 50ml tank with plain water; besides, if you want to breathe some aroma in, add some water-based aroma liquid. It will dispense your preferable outcome with a speed of 20-30ml per hour. Moreover, you can adjust the bracket of the humidifier and move it in the direction of your choice, by agreement or argument, that's your choice. But please, avoid the latter!