Bionic and streamlined fashion design, which won the national outlook top award-Red Star Award. Lower noise was acheived by using advanced round airway and multi-level noise decreasing design. Large LCD screen for cleaner figures. Cumulative time metering and timing off function. Technical data: Oxygen concentration: 93%±3% Oxygen flow: 0.5~3L/min Output pressure: 20~50kPa Operation noise: ?50dB (A) Input power: 320VA 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.