[Easy to carry] Household type, compact size, small volume, 3L , to meet the needs of different people, 93 percent 3 percent . Long life spanHigh life span, strong performance, Easy to operate, Plug in fast oxygen production, Eight levels of filtration oxygen absorption more peace of mind. The water tank can be wetted oxygen, So that the throat will not dry. Wide range of applications (the elderly, pregnant women, sports people, brain overload, stress, children, etc. can be used), Improve the quality of life, Only good health, Life will be good. Portable oxygen concentrator, 3-speed timing method of use:1. After plugging in the power supply or connecting the battery, press the red button, and the machine starts to work 2. Press the SET button once, the 20-minute indicator light will be on, indicating that the machine will keep running for 20 minutes, and it will automatically shut down after the end 3. Press the SET button twice continuously, the 40-minute indicator light will be on, indicating that the machine will keep running for 40 minutes, and it will automatically shut down after the end 3. Press the SET button three times continuously, the 60-minute indicator light will be on, indicating that the machine will keep running for 60 minutes, and it will automatically shut down after the end 4. Press the SET button four times continuously, and the 20 or 40 or 60 minute indicator light will be on at the same time, indicating that the machine will keep running for 4 hours, and it will automatically shut down after the end. Battery parameters: lithium-ion battery or 32.56Wh or 14.8V or 2200mAh or can be used for 80-120 minutes