portable oxygen machine 3L with extra batteries home and travel

Description

portable oxygen machine 3L with extra batteries home and travel.
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Chargable? The battery is 2200 mAh (about 0.5 hours, 2 hours full), you may need our 5500 mAh battery as an extra battery.
Simplified and compact control system with just one set of knobs. Press the SET button once, the indicator light is on, the machine will work for 20 minutes; press it twice, it will work for 40 minutes; press the third time, it will work for 60 minutes; press the 4th time, all 3 indicators will be on The device will work for 4 hours.
Noise Solutions: Weight: 5 lbs, Dimensions: 9.8"x4.72"x5.9". Lightweight and mini size for your travels. One year warranty.
Travel with Oxygen: It can be used with a car adapter when traveling, and the detachable rechargeable lithium-ion battery can be taken away for outdoor walks, and it can also be used with dual AC 110/220V power supplies.
Continuous oxygen supply: the concentration is 29±2%, and it is 3LPm.oise when it is lower than 50DB. and then automatically shut down to provide overheat protection.