This is a RENTAL You will be sent a contract that must be signed, dated and returned to us along with a copy of drivers license and credit card Rental deposit needed if machine is going international RX Required Quiet oxygen concentrator includes Invacare HomeFill system port for inventory flexibility. Minimize emergency service calls and troubleshooting time with the convenient patient-accessible reset button, self-diagnostic electronics and an Invacare Sieve-GARD Monitor to protect against sieve degradation. Oxygen Flow: 10 LPMOxygen Purity - 87%-95.6% At all flow rates Features: User-preferred neutral color to help blend in to any home environment Invacare SensO2 Oxygen Purity Sensor to warn you if purity drops Compatible with the Invacare HomeFill Oxygen System Battery-free power loss alarm for added peace of mind Three separate filters assure oxygen purity