Features 2-in-1 Ultrasonic Aroma Diffuser Use it with water as a humidifier or add 3-5 drops of essential oils to turn it into an essential oil diffuser. It adopts ultrasonic technology to oscillate & decompose water into cool mist molecules & adds moisture to the air. The fragrance of essential oil can effectively cover up odor, smoke, allergens, & harmful pollutants. Add few drops of your favorite essential oil to give your car a fresh, clean scent & help you relax, calm down, or stay focused. Compact & Portable 157 * 72 * 72 mm. Fit for cup holders in most 12V vehicles. Hold up to 70ml of water & work up to 3~5 hours, producing up to 10ml of moisture per hour. Mist & Light Control Start or stop diffusing by pressing the mist button. You can turn the LED lights on or off, or set the LED lights to warm white or cycle through 7 colors by pressing the light button. Anti-dry Protection & Auto Shut-off It is recommended to use about 3-5 drops of oil per 70ml water. When the water level is low, it shuts off automatically. User-friendly Design Made of BPA-free PP & ABS plastic. Use no filters. Easy to use & clean. It is extremely quiet with 1.7 M Hz ultrasonic frequency & less than 36d B noise. A DC 12V car power adapter is included. Note: 1) Add water below the MAX. line. 2) No essential oil is included in the package.