This probable comes with a shoulder case and new Cannulas and 2 Batteries and Manual. After a complete service from BOC in Auckland costing over $300 this unit as only been used for 1 day after. It can be used in the car with the cigarette lighter cable or full time in a home power supply /charger. This unit cost was over $4000.00 some years ago and bought only as a backup if needed during Corona. See a video how to use it on, https://www.medicalsearch.com.au/inogen-one-g3-portable-oxygen-concentrator-8-cell-standard-battery/p/257522

Compact and lightweight Weighing in at just 2.19 kg and measuring H22.23xW20.96xD5.08cm, the Inogen One G3 is your reliable companion wherever you go. Its simple design ensures minimal hassle during travel, even on flights. Four flow settings The G3 offers unsurpassed pulse-dosed oxygen delivery with its five adjustable flow settings. Whether you need a gentle boost or a higher dose, the G3 adapts to your oxygen requirements.

Ultra-quiet operation Patients appreciate the quietness of the Inogen One G3, especially at setting 2, where it emits only 39 dBA. Rest assured, your peace and comfort are our priority.

The single battery provides up to 4 hours of continuous use, Clinically proven for 24/7 use The Inogen One G3 is rigorously tested and approved for continuous operation, ensuring uninterrupted oxygen supply day and night.

See also my other listing with a fully serviced Philips EverFlow home concentrator and video link. Pickup from Titirangi Auckland or posted for the InogenOne only.