Lilion, this device is from Philips company and in general, it is good, very lightweight and mobile. Just search google for the spares - filters, etc, if these are available and not too expensive. Humidifier (I am not sure it is the right word) for medical purposes is installed inside the body of the oxycon, may be you'll need to pull it out, if it is still there. If it works (test it on 5 lpm, for some time), gives no yellow or red lights and just in case you'll be able to get service and spares, it is a very good deal. In my country Philips gives 60 months of warranty (this is over 40,000 hours) for the price of appr. 1100$ for a new one.
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