When only external power supply is used, the external power supply fails, check whether the external AC or DC power supply is normal, and whether the power socket contact is firmly connected; Powered by internal battery

When only external power supply is used, the adapter fails, replace the adapter or use internal battery power.

When the machine is powered by internal battery only, check whether the battery is exhausted. Replace internal battery.

The Air intake filter may be clogged, cleaning the air intake filter 

Molecular sieve failure/Control valve failure/control PCB failure, replace the backup oxygen source and contact the after-sales personnel. 

Nasal cannula falling off, Reconnect the nasal cannula

No one is using the machine, please turn off the machine when it is confirmed that no oxygen inhalation is needed.

Replace the battery or use an external power supply

Respiratory rate detected outside the operating range of the device.

Check whether the oxygen inhalation tube is bent and whether it is worn correctly.

During strenuous exercise, wait until you have calmed down before inhaling oxygen.