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 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 . Because the unit is so small, it relies

Buy Airsep Focus Portable Oxygen Concentrator 〈UHD〉

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

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