The AC power supply for the SeQual eQuinox portable oxygen concentrator is ideal for times when you are doing things around the house and need to recharge your eQuinox. Upon opening the power supply you will need to connect the power cord to the power brick. The AC power supply attaches to the charging port on the unit, then plugs into any one of your homes standard wall outlets. When recharging the 12 or 24 cell eQuinox batteries with the AC power supply, it can take anywhere between 1.8 – 5 hours depending on the setting being used to fully recharge a depleted battery. You will always want to make sure to have this with you at all times during your traveling experiences. This power supply operates on 100 – 240 VAC, 50 – 60 Hz, with 12 VDC nominal output.