Easy to Use - Input: Powered by two AA batteries or USB cable to make it work.quiet running: =25 dB.It is perfect for home use. Comfortable Airflow - Continuous output of stable air pressure.Continuous air pressure provides efficient spray, improves atomization efficiency, and atomized particles are finer. Principle of Atomization - The mesh atomization device converts the liquid into a gas jet,which is breathed by people.use with mask or mouthpiece. Less Residues - The solution cup reaches up to max 8cc, and the solutions can be completely break down with the device. After using, the residues is less than 0.1ml. Efficient Atomization - This nebuliser has faster atomization rate,It creates a fine mist, the small particles are around 2-3 µm.providing dependable efficient nebulization treatments.