I purchased this Concentrator from Intermedical on 26 January 2016 and is guaranteed for 3 years. It comes with a 3 year service plan (first service being due on 27 January 2017) and your details can be transferred on purchase. The courier picks up the Concentrator from your home and returns it to you once serviced. The double battery allows for 8 hours of continuous use. In car battery charger, charges whilst in use. The Concentrator comes with a shoulder carrier case as you will see from the photographs. This is an updated product. Great for getting about, going on holidays and is aircraft approved. The total price I paid inclusive of the 3 year service plan was £2,278. I would sell for £1,550.