AC Power Adapter Wall Charger Cord PSU for Casio Keyboard CTK-551 CTK551 6 FT Extra Long AC Adapter For Casio CTK-551 CTK551Keyboard Wall Charger Power Supply Cord PSU Input Voltage : AC 100-240V; Input Frequency : 50-60Hz Adapter; Cable Length: 6 FT US Standard Plug, Short circuit Protection.Light in weight and with heavy-duty cable-wire. Industry Quality : Over Voltage Protection, Over Heat Protection, CE Compatible with:Casio CTK-551 CTK551 Paino Keyboard.