A. 【Large Capacity Water Diffuser】 This aroma diffuser comes with a large 400ml water tank, which can work for 6 - 10 hours. B. 【Ultrasonic Aromatherapy Cool Mist Diffuser】 The aroma diffuser has 2 adjustable cool mist modes: continuous and intermittent. C. 【Pure Essential Oil Electric Humidifier】 This diffuser is a combination of essential oil diffuser and humidifier. Add essential oils to the water tank to create an aromatherapy atmosphere. D. 【7 Color Changing LED Lights】 This air aroma diffuser can be used as a night light at night. It has 7 color changing LED light colors and 2 light modes (automatic changing/fixed on one color). When you press the light button, 7 colors will be displayed - change, then press the light button again, color 1 will be fixed. E. 【4 Timers and Auto Shut - Off】 This aromatherapy device has 4 different timers, namely 1 hour/3 hours/6 hours/ON (continuous operation). When the time is up, the aroma diffuser will automatically turn off. The aroma diffuser uses a smart built - in protection system. It has an auto shut - off function when the water is turned off.