COOL MIST HUMIDIFIER: The PureGuardian H940 AR ultrasonic cool mist humidifier guards against dry air in the home, perfect for those with colds, allergies and dry skin. The easy to fill 0.5 gallon tank is ideal for 350 sq. ft. rooms and runs up to 30 hours on low SILVER CLEAN PROTECTED TANK: Silver Clean technology helps to keep the humidifier tank cleaner longer AROMATHERAPY TRAY: The aromatherapy tray option helps create a relaxing environment with your favorite essential oil. Oils are not included. Create a better home environment and optimize your comfort with an ultra-quiet, soothing cool mist ADDITIONAL FEATURES: This table top humidifier has a low water indicator light which lets you know when to refill the tank. The night light feature makes it a great addition to kid's rooms. Multi-directional mist, automatic shut-off when tank is empty PureGuardian: by Guardian Technologies offers a full range of small appliance-based solutions for happier and healthier lives at home, focused on creating powerful, safe and innovative technologies to help facilitate healthier, happier home environments