Inogen One G4 AC Power Supply Oxygen Concentrator With the headgear clips removed Power Built in Rechargeable With the headgear clips removed while Fisher & Paykel's Glider Straps and and Easy Release Cord distribute pressure equally across the face and automatically adjust the mask alignment during sleep 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 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