Lightly used 2 Batteries included OBO make an offer The Inogen One G5 is designed to provide supplemental oxygen for individuals with respiratory conditions, offering high flow and portability. Oxygen Flow: Pulse dose delivery system with 6 flow settings (1-6). Maximum Oxygen Output: 1,260 mL/minute (1.26 LPM). Oxygen Concentration: 87% to 96% at all settings. Weight: 4.7 lbs (with single 8-cell battery); 5.7 lbs (with double 16-cell battery). Dimensions: 7.19 L x 3.26 W x 8.15 H (with single battery). Battery Duration: Single Battery: Up to 6.5 hours (at flow setting 1). Double Battery: Up to 13 hours (at flow setting 1). Noise Level: Approximately 38 dBA at setting 2, which is comparable to a quiet library. Operation: Can be run on rechargeable lithium-ion battery, AC (wall) power, or DC (car) power. Technology: Features Inogen's patented Intelligent Delivery Technology® which adjusts oxygen delivery to a user's breathing rate, even during sleep. Connectivity: Bluetooth-enabled for use with the Inogen Connect App to monitor battery life, column status, and other device functions. FAA Approval: Meets all FAA requirements for use on commercial aircraft. Maintenance: Minimal, primarily involving regular cleaning of the reusable particle filter and annual replacement of the sieve beds (metal columns), which can be done by the user. Reviews and Usability The Inogen One G5 is a popular choice among users for its balance of power and portability. Portability: Reviewers praise its lightweight and compact design, making it suitable for active individuals and travel. Battery Life: The extended battery options are a significant highlight, allowing users to go out for longer periods without needing a recharge. Quiet Operation: Its low noise level makes it a good option for social settings and nighttime use without causing disturbance. Limitations: It is a pulse-dose only machine and is not intended to be life-sustaining; an alternate oxygen source is recommended in case of power failure or mechanical issues. It also cannot be used with a CPAP or BiPAP machine, which requires continuous flow oxygen.