Item specifics Condition: New: A brand-new, unused, unopened, undamaged item (including handmade items) Brand: Freestyle Features UltraSense technology to automatically calibrate oxygen level to your needs. Five pulse setting choices deliver up to 1050 mL/min of oxygen Easy-to-read user Interface Wearable and lightweight at less than 5 pounds Ergonomic, curved design FAA Approved for onboard/in-flight usage Fully functional on AC or DC power CAIREView Telehealth Technology Alarms/Alerts Start Up No Breath Detected Low Battery Shut Down Low Battery Warning Warm-Up Low Concentration Battery Over Temp High Temperature, Low Temperature, High Pressure, Breathing Rate Exceeded, Fan Failure, Low Pressure Battery Duration Setting of 1 - 8-Cell Battery: 8 hours average Setting of 2 - 8-Cell Battery: 4 hours average Setting of 3 - 8-Cell Battery: 3 hours average Setting of 4 - 8-Cell Battery: 2.25 hours average Setting of 5 - 8-Cell Battery: 2 hours average Flow Settings Pulse Dose (Settings from 1 - 5) 1 = 210 mL/min 2 = 420 mL/min 3 = 630 mL/min 4 = 840 mL/min 5 = 1050 mL/min