High frequency oscillation,more finer particles,large and stable atomization amount, timing shutdown. USB humidifier special micro-hole atomization film, surface silver layer protection coating, the front side is white piezoelectric ceramic ring, the back is all steel material, waterproof solder joint, to prevent open circuit. The atomizer plat should be used with the same frequency circuit board so as to achieve the perfect spray volume. Our atomizer plate with 5V frequency driver board, it is more convenient compared with other product. You can start the board via the button after power the module. Name: Drive line block Special microporous atomizing film, voltage 5V, frequency 110KHZ, power 2W, aperture 5um, number of holes 740 holes, wire length 8cm. Colour: green Material: composite materials Package Contents: 3 * 20mm Ultrasonic Mist Maker Ceramic Discs 3 * Driver Board 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.