Features: Fine Sprays particles, large atomization amount, and no wet desktop. Low driving voltages, low power, low impedance, high conversion efficiency. Sprays in middle of the atomizing sheet, 5um ultra-fine Sprays apertures and 740 ultra-dense Sprays apertures. The protective coating process of silver oxide layer on surfaces of atomizing sheet has long service life. Engineered for stability misting capabilities, this module guarantees prolonged reliability and performances for all your humidification needs. Specifications: Component:Plastic Model: AK-204 Voltages: 5V Current: 300mA Power: 2-3W Resonance frequency: 108-110KHz Material: 1.2mm FR4 Board size: Approx. 34x22.5mm/1.34x0.88inch Package Includes: 1 Set USB Humidifier Module note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.