Ideal Gifts for All: Made of BPA free plastic, this essential oil diffuser is safe for the baby and the pregnant. With intelligent power-off protection, it will automatically stop working to prevent dry burning when water runs out. Also, the vase shape and overall wood grain water transfer color make it easily integrated into your room decors. It suits salon, spa, yoga, bedroom, living room, nursery, office, and so on. A great gift for a friend or a treat to pamper yourself with. Colorful Ambient Lights: Short press the light button to create a dreamy ambiance with color cycling mood lights. Perfect for creating a sweet and romantic atmosphere and helping you get a restful sleep. Short press again to switch between 14 fantasy light options (7 colors with bright/dim options) and set a fixed light to match your mood. Long press the button to turn off the light seperately. Soothing Sound White Noise Machine: Built-in high-power speaker and 9 soothing sounds (Rain/Fire/Wind/Ocean/Forest/Brook/White noise/2 Piano Tracks). You can choose and play the sound while diffusing essential oils to help you fall asleep and make you refreshed. The white noise sound is also very suitable for office privacy and covering up the background noise, like blocking noisy neighbors, growling dogs and city sounds. Tips: long press the forward and back button to adjust the volume. One Fill for All Night Cool Mist & Aroma: With 500ml large water tank, this ultrasonic oil diffuser doesn't requires frequent refills. It can spray cool mist for up to 13 hours with only one full fill of water when it's set to weak mist mode and 8 hours in strong mist mode. You can also set 4 timers (1H/2H/4H/On) according to your needs. Note: the machine will automatically stop spraying mist once the timer is up or when there is not sufficient water detected. 4-in-1 Spa Diffuser: Use this 4-in-1 machine instead of four seperate ones to save space and avoid multiply wires. It will bring an extraordinary olfactory, auditory and visual experience when you use this aromatherapy diffuser cool mist humidifier together with the built-in natural sounds/music and soft lights, making both of your body and mind feel pleasant and relaxed. Note: you can also use the mist/music/light function seperately.