For longer outings, you can use the AirBelt (optional accessory), which can extend total operation time up to 7 hours .
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.
Because the unit is so small, it relies on external batteries to keep its weight low:
Batteries take approximately 4 hours to fully recharge. Buying Guide: Where to Purchase Purchasing an AirSep Focus requires a medical prescription . AirSep Focus Portable Oxygen Concentrator - SpryLyfe
Features "UltraSense" technology, which is highly sensitive and ensures oxygen is delivered with every breath, even during shallow breathing.
It delivers a fixed pulse flow setting of 2 liters per minute (LPM) .