20mm diameter ultrasonic atomizer plate povides with more finer particles that your desk or other platform can be well protected against dampness. Easy to use. After charge the frequency sweep driver board, the key to start. It can work well over the water's , absorbent sponge or towelwith more finer particles and higher level. Widely used in the ultrasonic atomization devices, USB humidifier, perfume atomizer, aromatherapy atomizer and other atomization devices. colour: as shown Material: PC+metal+ceramic Size: atomizer diameter 20mm Package Contents: 2 x Ultrasonic Atomization Maker Only the above package content, other products are not included. Note: Light 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.