Buy Airsep Focus Portable Oxygen Concentrator -

Standing only 6.4 inches tall, the device can literally fit in the palm of your hand or be worn comfortably on a belt or shoulder strap.

Because the unit is so small, it relies on external batteries to keep its weight low: buy airsep focus portable oxygen concentrator

Typically comes with two micro batteries, each providing roughly 1.5 hours of use, for a total of 3 hours . Standing only 6

The AirSep Focus, manufactured by CAIRE, is recognized as the world's smallest and lightest medical-grade portable oxygen concentrator. Weighing just 1.75 lbs (0.8 kg) for the unit itself, it is designed specifically for active patients who require low supplemental oxygen (pulse dose setting of 2) without the burden of heavy equipment. Standing only 6.4 inches tall