The GuardianMist Gray Essential Oil Humidifier effectively adds humidification into the air by releasing moisture which relieves dryness, provides comfort and guards yourself. The essential oil may be added directly to the water tank for fragrance and added therapeutic benefits. Comes with a Bonus 10mL Eucalyptus Essential Oil that is well-known for its Cooling and Invigorating properties. GuardianMist also features High and Low Mist Intensity options and 2, 4 and 8-Hour Mist Shut-Off Timer. The water tank is injected with an antimicrobial agent that prevents microbial buildup in water after extended use for a healthier and effective operation.