This aromatherapy essential oil nebulizer adopts advanced thermostat-controlled mini air pumping technology to vaporize essential oil in its tempered glass tank; it is whisper-quiet and energy efficient; it requires no heat, no water, and can quickly spread out aromas all over much bigger area in just a few seconds because it is using air pumping instead of ultrasonic waves for diffusing. Admired and used by most professional aromatherapists, it has the optional preprogrammed interval control usage cycle, 5 minutes on and 8 minutes off and so on until your selected timer is up. You can choose four different diffusing timers (30, 60, 90, 120 minutes). With its three selective diffusing speeds (high, medium, low), you can easily limit the amount of scent emitted for different sizes of rooms with lighter or stronger fragrant.