Frequently Asked Questions (FAQs) FAQs for Product: Resmed S9 Elite™ Inc H5i Humidifier 1. Hi, Can the pressure be varied e.g.(6-20)on this machine? (Posted: 27th April, 2010) 2. Can I use my existing Mirage Activa LT nasal mask & tube for S9 Elite? (Posted: 23rd August, 2010) 3. Is there a 12v model, or any way that I can use this machine whilst camping? (Posted: 13th April, 2011) Question & Answers for Product: Resmed S9 Elite™ Inc H5i Humidifier Q. Hi, Can the pressure be varied e.g.(6-20)on this machine? (Posted: 27th April, 2010) A. The pressure choices range from 4 to 20 cm.h2o, but, once set, are fixed at that level. It is not an Automatic machine. Back to Top Q. Can I use my existing Mirage Activa LT nasal mask & tube for S9 Elite? (Posted: 23rd August, 2010) A. Yes, tube sizes are standardised now. Back to Top Q. Is there a 12v model, or any way that I can use this machine whilst camping? (Posted: 13th April, 2011) A. There is a 12 volt converter available that allows the machine to run from a cigarette lighter type connection. Link is here . . http://www.cpapaustralia.com.au/shopping/resmed-dc-12v-24v-s9-model-converter-36970.html Hope this helps. Back to Top Submit A New Question Can't Find The Answer You're Looking For? Submit Your Question Below: Related Product:  Resmed S9 Elite™ Inc H5i Humidifier Your Question:  (Please enter One Question Only! You can ask as many questions as you like, but do not combine them into one post!) Your Reply Email Address:  Security Step:  Enter the text to the Left in the space below: [ CLOSE WINDOW ]