Donut Ultrasonic Scentilizer Aromatherapy Diffuser & Humidifier: Humidifies and scent the air through ultrasonic vibrations at a frequency of 1.70 Khz Recommended space up to 220-270 square feet Continuous atomization time of 3-4 hours Heat-free diffuser delivery method Built-in speaker that plays a stream of pre-programmed music or music from MP3, MP4, Phone or CD player Displays an energy efficient LED light with switching colors You can add a few drops of essential oil to the water and fragrance the mist in the air Use only with Essential Oil, (sold separately) Measurements: 10.5" DIA x 3.75" H" material="Porcelain, frosted glass" origin="China"