Hello, the suggested change interval for the filter is 1 year or as needed.

Thank you for your comment. The vents are external to the deice, you can clean the exterior with a soft cloth slightly dampened with soapy water or with anti-bacterial wipes (Isopropyl alcohol 70% solution).

Thank you for your comment. If no inhalation is detected for 60 seconds when in pulse mode, the “Check Cannula” alarm will be activated and the device will automatically enter Auto-Mode and continue to deliver oxygen at a rate of 18 breaths per minute. When an inhalation is detected, the device will clear the “Check Cannula” alarm and exit Auto-Mode.

@@theGCEgroup I found the "test mode" : push 5 sec. the battery button and the alarm button simultaneously.

Hello, where are you from please? I will try to provide you with the service in your location. Thank you.