Thank you for contacting me, in fact I was going to contact you myself. I have just charged the battery and set it up for my wife to use and I need to know / need your assistance!. The machine given to my wife basically made her home bound, and purchasing you apparatus gave her the freedom to move/travel ETC, the only query my wife has is that the machine given by the Spanish Health authorities is big and cumbersome and the pressure is set at 1.5 Atmospheres!, and basically I set your machine on number 2 and my wife noticed that Oxygen is released whenever the inhales, where as the one she uses has a constant supply of air, so what I would like to now if that is the way the machine works and since the spurt of air released in minimal will it be OK to increase the pressure to 3 and since the machine , including the Cannula is also new it the smell from the machine or the plastic pipes is effecting her so I need to know should I keep it running for sometime to let the Air concentrator basically clean itself by expelling the Air because at present she feels nausea when using it . The machine is exactly what my wife wanted and she is happy with it (freedom at last) I am sorry to trouble you but would like to know how to get rid of the smell of plastic in fact I intend to buy a Cannula from the Chemist to see if that will help, you assistance will be greatly appreciated