Features:  Rechargeable In Car: If you’re away from home, you can easily recharge your oxygen concentrator in your car. Light, Mini and Portable. Only approximately 0.84KG(1.13lb), easy to carry. 2 Hours Battery: The battery can be used 2 hours after fully charged. Low Noise: At less than 40 decibels, the quiet hum of this concentrator won’t disturb or distract you, so you can sleep peacefully and carry on conversations. Intelligent oxygen therapy circulatory system: One intelligent oxygen therapy cycle time is 20 minutes. Stable Oxygen Flow: Our reliable concentrator gives out a steady flow of oxygen so your oxygen blood levels stay stable. Specification: Model number HC-30M Oxygen flow mode Continuous flow mode Oxygen flow rate 3lpm Oxygen purity 30%+/-2% Weight 0.84KG(1.13lb) Noise ≤ 40db at any setting Size 390mm*275mm*120mm Charge time is approximately 30 minutes fully charged Battery duration 2 hours at 3lpm