The Harmony Ultrasonic USB Diffuser is a stylish and compact way to bring wellbeing into your home. With a colour-changing spectrum powered by LED technology, misting of up to 2 hours and a water capacity of 100ml, it offers a quick and convenient solution for air purification and humidity needs in the home. Versatile and practical, it also allows you to enjoy the benefits of aromatherapy anywhere in your home by adding a few drops of any of our essential oils to the water. How to use: 1. Place diffuser on an even surface. 2. Turn the outer cover and remove it from the diffuser base. 3. Open the water tank cover and fill with water. 4. Add 3-5 drops of 100% pure essential oil into the water. 5. Replace the water tank cover and then place the outer cover back onto the diffuser base. 6. Connect USB cable to a computer or suitable 5V power adaptor. 7. Use buttons on the front of the diffuser to set required mist and light options.