Easy to use. After charge the frequency sweep driver board, the key to . It can work well over the water's , absorbent sponge or towelwith more finer particles and higher level. 20mm diameter ultrasonic atomizer plate povides with more finer particles that your desk or other platform can be well protected against dampness. Widely used in the ultrasonic atomization devices, USB humidifier, perfume atomizer, aromatherapy atomizer and other atomization devices.