The first ultra-quiet oxygen concentrator available at such affordable pricing! Our huge volume means huge savings for you! The Respironics EverFlo Q is a smaller and lighter, ultra-quiet 5-LPM oxygen concentrator! Respironics took the top-selling EverFlo and added special noise-reducing features to make a virtually silent oxygen concentrator. Get all the benefits of an ultra-quiet oxygen concentrator without the big price. It weighs just 31 lbs! The Respironics EverFlo-Q model is much quieter - rated at just 40 db of sound - well below many other oxygen concentrators on the market today. And saves you money by using less electricity than many other 5 lpm oxygen machines. The concentrator includes the "OPI" (Oxygen Purity Indicator), a built-in oxygen analyzer that constantly verifies the oxygen delivered is more than 88% pure - or it sounds an alarm to warn you! Get a premium oxygen concentrator without paying the premium price!. SAFE! The flowmeter is recessed to prevent breakage and easy to set. The Respironics EverFlo-Q oxygen concentrator has a durable compressor with a pressure relief valve and a thermal protection switch to prevent overheating. Low & high pressure alarms are standard. The humidifier platform will work with any style bottle and has a simple velcro closure. Uses just 350 watts of power, saving you money! Easy-rolling wheels and a large handle on top (and just 31 lbs) make it easy to move! No filters to change for at least 2 years. Durable - Respironics has a reputation for building and delivering top-quality products The EverFlo-Q will definitely impress you! Respironics proudly backs the EverFlo-Q oxygen concentrator with a 3-Yr Bumper-To-Bumper Warranty (additional warranty available)! We've been selling oxygen concentrators since they were introduced in the 1970's, so we know our equipment. We strongly recommend the new Respironics EverFlo Q quiet oxygen concentrator as a reliable, low-maintenance machine. Our trained technicians can often solve service problems over the phone. We stand behind the concentrators we sell with true customer service. Technical Specifications Dimensions - 23"h x 15"w x 9.5"d, | Weight - 31 lbs, | Delivery Rate - From 1/2 to 5 liters (1/2 liter increments), | Oxygen % - 93% at 1/2 to 5 liters (+/- 3%), | Electrical Requirements - 115V, 60Hz, | Power Consumption - 350 Watts average. Warranty 3 Year Limited Warranty from Respironics, Bumper-to-Bumper *HOT SUMMER PRICE - JUST $599! Pray for me, please :) $600 is a lot of money to me. But, well worth it if it keeps me breathing, something that Medi-Cal does not seem to care if I do or not :(