The Respond C5 Conserver is the patients' choice with it's ultra-quiet, sensitive and patient-friendly design. 2-in-1 function with built in regulator for continuous flow use of 2, 3 or 4 LPM. 5:1 Conservation ratio (1, 2, 2.5, 3, 4, 5 LPM). Uses standard, off the shelf cannula. Whisper-quiet function. 3 year warranty. Rated for use up to 3000 PSI. Add your name and logo to the Respond C5 to maximize your marketing each and increase referrals.