Specifications include, but are not limited to: Oxygen Concentrator, **PURCHASE** with Oxygen Monitor; Maximum Sound Level: 55 dB; Maximum Electrical: 120VAC Input Voltage, 60Hz; Minimum Oxygen Output Concentration Levels: 87% to 96% at 0.5-5L/min; Maximum Outlet Pressure: 5 PSI (+/- 0.5 PSI); Minimum Operating Flow Rate: 0.5 to 5 Liters per minute; Must be capable of operating up to 24 hours per day; Must include the following safety features: Battery Free Power Loss Alarm, Low Pressure Alarm w/compressor shutdown, High Pressure Alarm w/compressor shutdown, High Temperature Compressor Shutdown, Current Overload or Line Surge Shutdown, Oxygen System Possible Obstruction Alert; Maximum Weight: 55 lbs; Cabinet must be Impact Resistant, Flame-Retardant Plastic that conforms to UL 94-V0; To include all of the following: Cabinet Filter, Outlet HEPA Filter, Compressor Inlet Filter, a Minimum 7 ft cannula with a maximum