Features:  Large capacity lithium battery:Not affected by power failure,it can also be used outdoors. Vehicle power supply:Power supply of vehicle lighter. Atomization drug delivery:One machine for two purpose.Follow the doctor's advice.More convenient atomization at home. Intelligent infrared remote control:There is no need to stand up frequently.Use the remote control to operate the oxygen concentrator. Original backpack:Convenient to carry.Strap the backpack directly behind the seat,taking up almost no space. Powerful oil-free compressor:DC compressor,efficient and stable.With flexible connection,it is quieter.Providing continuous surging power for the oxygen concentrator. Triple filtration system：The three-level layer-by-layer filtration system deeply cleans the air before the oxygen is released, and efficiently filters out impurities such as fine dust. Specification: Model Number Portable Battery Oxygen Concentrator DZ-1BCW Oxygen Flow Mode Continuous Flow Mode Oxygen Flow Range 1 to 7 Setting Oxygen purity (When The Flow≤1L±0.3L)90%±3% Weight Machine Weight About 4.5KG Noise ≤ 60 dBA At Any Setting Dimension 260mmx137mmx291mm charge time is approximately 4 to 5 Hours Per Battery From Fully Discharging Battery duration 110-120 Minutes@1-7 Setting Any Flow