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 and decompose water into cool mist molecules and adds moisture to the air. The fragrance of essential oil can effectively cover up odor, smoke, allergens, and harmful pollutants. Add few drops of your favorite essential oil to give your car a fresh, clean scent and help you relax, calm down, or stay focused. Compact and Portable 157 * 72 * 72 mm. Fit for cup holders in most 12V vehicles. Hold up to 70ml of water and work up to 3~5 hours, producing up to 10ml of moisture per hour. Mist and 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 and 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 and ABS plastic. Use no filters. Easy to use and clean. It is extremely quiet with 1.7MHz ultrasonic frequency and less than 36dB 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.