FEATURES? Complete plastic out shell, safe and reliable. Timing turn off function allows convenience use. Quality press safety valve ensures better security. Installed power cut warning function. Compressor with heat protection which ensure safe of the compressor and concentrator. Power cord and nasal oxygen cannula etc. accessories can be put in the store box. Can be connected with nebulizer to have nebulizing cure. Technical data: Flow range: 0.5?3L/min Oxygen concentration: 93%±3% Output pressure: 20~50kPa Pressure relief mechanism operational at: 250kPa±25kPa Operation noise level: ?55dB (A) Input power: 320VA Minimum operating time: 30minutes The "W" behind the item name means with nebulizing function , we can adapting nebulizer function to every oxygen concentrator. Oxygen concentrator (with nebulizer function) provided by yuwell uses the combination of oxygen uptake and atomization function to offer clean and safe air. Furthermore it's a multifunctional machine that also assist in atomized treatment while maintaining the same oxygen concentration.