Features:  Rechargeable In Car: If you’re away from home, you can easily recharge your oxygen concentrator in your car. Light, Mini and Portable. Machine with battery weight approximately 5lbs, easy to carry, weight may have an error of +/-0.5KG. 80-120 Minutes Battery: The battery can be used 80-120 minutes after fully charged. Low Noise: At less than 43 decibels, the quiet hum of this concentrator won’t disturb or distract you, so you can sleep peacefully and carry on conversations. Stable Oxygen Flow: Our reliable concentrator gives out a steady flow of oxygen so your oxygen blood levels stay stable. Specification: Model number HCN-5B Oxygen flow mode Continuous flow rate Oxygen flow rate 1-5lpm Oxygen purity 28%~90% Machine with battery weight 5lbs Noise ≤ 43db at any setting Size 94.8*195.5*242mm Charge time is approximately 3-4 hours fully charged Battery duration About 80-120 minutes