Microporous atomizer sheet, uniform and delicate mist Ultrasonic transducer ceramic sheet, high frequency breaks water molecules Metal sheet, strong conductivity, stable mist Waterproof silicone ring, prevents water leakage and protects circuit safety. Our air humidifier uses the latest ultrasonic technology, running more quietly, with a noise level of less than 28 decibels. Make sure it 't disturb you while you sleep or work. Also, just make sure to soak the cotton core for 5-10 minutes before turning on the machine for the best results. Colour:White Material:Plastic + Electronic Components Package Contents: 1 x humidifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.