The Caire FreeStyle Comfort AC power supply is a must have accessory for your daily oxygen therapy usage. The AC power cord will charge your Caire FreeStyle Comfort battery that's installed in the unit, but also provide an uninterrupted flow of medical grade oxygen no matter the flow setting you use. The AC power supply is a vital part of your daily and nocturnal routine with your FreeStyle Comfort portable oxygen concentrator. The AC power supply works with any standard wall outlet, turning your Caire FreeStyle Comfort POC into an easy to recharge device. Simply connect it to any 110V wall outlet using compatible international power cords (US, European, and UK). This essential accessory ensures you can maintain your oxygen therapy while keeping your battery fully charged for when you need to go mobile, providing reliable power whether you're at home relaxing or sleeping through the night.