Lightweight (2.2kgs) and compact. 3 pulsed settings equivalent from 1-3 litres per minute. Gives 5hrs+ oxygen without charge. Can run from mains power, the car, boat or caravan. Will adjust to the various international power characteristics. Good for cruise, weeks away in the sun etc. FAA approved means it can be used on flights (with permission). 4 years old - lightly used for days out and travelling to and from holidays. Cost £2995.00. Offers invited.