I bought this in America a few years ago and only used it for travel, it is very compact with a small footprint. It comes complete with a heated humidifier and has only 815 recorded hours. It can be used in AutoAjust or fixed pressure cpap mode, it also operates with 12 volt dc input (lead not supplied). This machine has UK electrical connections. It has never been exposed to pets or smoking. I have The Clinician’s Guide and The User’s Manual in downloaded pdfs and can email these to buyer. The current model is hardly different and sells for £399 excluding humidifier, the humidifier is an extra £119 making £518 in total – would sell for £175 including UK shipping costs. Check it out; it is the perfect back-up machine https://www.eu-pap.co.uk/sleepcube-autoadjust-plus-autocpap.html . This is the successor to the one on offer.