U-garden Eco-friendly Air Humidifier Purifier Evaporator Home Bedroom Office After the use of this Eco-friendly air humidifier, the air humidity of a circumference of 5 square meters indoor environment will increase approx 8%. Please add purified water into U-Garden. You may add several drops of essential oil for aromatherapy (essential oil not include). Periodic cleaning is necessary. Suitable for home office etc. Creative Environmental.