Easy to use. After charge the frequency sweep driver board, press the key to . 20mm diameter ultrasonic atomizer plate povides with more finer particles that your desk or other platform can be well protected against dampness. 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. 0