Bionics sleek appearance design This oxygen concentrator adopts large screen design with distinct numbers. It also has functions of time accumulating, timed shutdown, power-off alarming and nebulization function, hence maximizing convenience. Technical data: Input power: 400VA Oxygen concentration: 95.5%~87% Oxygen flow: 0.5~5L/min Output pressure: 40~70kPa Operation noise: ?53dB (A) 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.