Universal 4.5V 250mA 2.1mm [Center Positive] AC Power Adapter / Charger INPUT: 120V 60Hz Non-Polarized 2 Blade Style OUTPUT: Regulated 4.5VDC (4.5 Volts) .25A (250ma) Features Unregulated - Linear Power 6' Cord Length, 5.5mm OD / 2.1mm ID *Center Positive* UL Listed (USA/Canada), For Indoor Use Only.