ARYA Mini/Rhythm P2-S3 and P2-S4 Portable Oxygen Concentrator External Battery Charger w/AC Power Cord

Convenient Charging: Charge one battery while using another with the external battery charger. FAA Compliant: Ensure you have 150% of flight time in battery life when traveling. Multiple Battery Compatibility: Works with ARYA Mini, Rhythm P2-S3, and P2-S4 batteries.