Healthgenie Oxygen concentrator 7F-3 is a product that is chiefly composed of making host, flow meter and humidifier. It also has a safety plastic shell with timing power off function. This oxygen concentrator has power loss function which further strengthens it's functionality. It's compressor with thermal protector guarantees better security. Key Features: Maximum recommended flow: 3L/min Flow range:0.5-3L/min Change in maximum recommended flow when back pressure of 7kpa is applied:<0.5 L/min Oxygen concentrator: 93% ±3% Minimum operating time: 30 minutes Weight:24 kg Noise:âÂÂ¦55db(A) Electric classification: class 2,type BF application part Work system: work continuously. Accessories list: 1 set User's manual 1 piece Filter core. We provide a 24 months off site warranty with this oxygen concentrator.