EPtech AC / DC Adapter For Bose SoundDock N123 Portable System Power Supply Cord Charger PSU(Note: This is 20V DC Barrel Tip AC Adapter, not +/-18V.) AC Input 100V-240V 50-60Hz;DC Output 20V Industry Quality : Over Voltage Protection, Over Heat Protection Brand New Adapter, 100% Compatible Warranty:1 year warranty, 30 day money back guarantee Shipping from USA !