Typically comes with two micro batteries, each providing roughly 1.5 hours of use, for a total of 3 hours .
For longer outings, you can use the AirBelt (optional accessory), which can extend total operation time up to 7 hours . buy airsep focus portable oxygen concentrator
Because the unit is so small, it relies on external batteries to keep its weight low: Typically comes with two micro batteries, each providing