Technical data: Please refer to 7F-3A. More function: With time accumulating function, timing power off function Fault self-detection system. Four alarm functions: Power failure alarm Low oxygen concentration alarm Pressure cycle failure alarm Compressor failure alarm 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. 7F-3E Technical data: Input power: 380VA Oxygen flow: 0.5~3L/min Oxygen concentration: 93%±3% Output pressure: 20~50kPa Operation noise: ?50dB (A) Positive intake, air cleaner, molecular sieve life longer More function: With time accumulating function, timing power off function, fault self-detection system. Four alarm functions: Power failure alarm Low oxygen concentration alarm Pressure cycle failure alarm Compressor failure alarm