This Aroma Diffuser uses Ultrasonic waves to instantly vaporize water and essential oil in the tank， to produce a beautiful fragrant mist. Produces negative ions which help to lift your mood and relieve stress. It also can moisturizes and refreshes the quality of air we breathe. Specifications: Material: ABS+PP Dimensions: Approx 8.27*6.57*3.15 Inches Capacity of water tank: 250ML Noise Level: less than 35 DB Electric consumption: Approx 12W Keep essential oil 100% natural without burning or heating and automatic shut off safely. Application: Bedroom， Living room， Beauty salon， SPA， Yoga， Conference room， Office， Reception center， Toilet， baby room， Hotel， Hospital or any other private / public circumstance. Package Content: 1 x Aroma Diffuser 1 x Charger adaptor 1 x measuring cup 1 x User Manual Note:Oil is NOT included in this package).