Double spray module USB humidifier drive circuit board atomization experiment equipment Ultrasonic DIY incubator equipment Product features Fine spray particles, large amount of fog, not wet desktop. Low driving voltage, low power, low impedance, stable waveform and high conversion efficiency; The middle spray, 5um ultra-fine spray aperture and 740 ultra-dense spray aperture of the atomizer; The protective coating process of silver oxide proof layer on the surface of atomizing film has long service life. Product parameters Working hard: atomization drive circuit board Model: ak-204 Rated voltage: DC 5V Rated current: 300mA Power: 2-3W Resonance frequency: 108-110khz Material: 1.2mm FR-4 Plate size: 34x22.5x17mm The net diameter of atomizing steel sheet is 16mm, the outer diameter of silicon rubber ring is 20mm, and the length of wire is 95mm. (red wire positive, black wire negative) _x000D_