This is a premium fixed pressure device with an integrated humidifier, cellular connectivity, and event detection. There are MANY extras included in this sale from hoses, masks, filters, harnesses, and original carry case and power adapter. The unit has been in storage for quite some time but has been power tested and cleaned since unpacked. Some packages included as extras may be opened from storage or previous packing. Sanitation of all pieces should be implemented prior to initial use.