Uses Ultrasonic waves to instantly vaporize water and essential oil in the tank, to produce a cool, dry fragrant mist. Tank Capacity 120ml LED light - 7 colours Powered by USB plug ( length of the cord 100cm) Auto power off when water runs out This aroma atomiser provides a gentle mist of fragrance, creating a peaceful and relaxing atmosphere. Its color-changing LED lights add a beautiful ambiance to any room. Use with Essential Oils or Fragrance Oils.