Inogen One G4 AC Power Supply Oxygen Concentrator and connect the cord into PR531 LAR USA and connect the cord into the recessed power port on the side of the Equinox to charge up the battery inside of it you might find that a transfer bench from Drive Medical is the solution you've been looking for This InogenOne G4's Universal AC Power Supply automatically adapts to input voltages from 100V to 240V (50 60HZ) permitting use with most AC (Wall) power sources throughout the world USAGE: When plugged into wall power this power supply WILL charge any battery installed in your G4 concentrator regardless of whether the device itself is currently turned on