AC Replacement Adapter for Casio CT-638 CT638 Keyboard Power Supply Cord 6 FT Extra Long AC Replacement Adapter for Casio CT-638 CT638 Keyboard Power Supply Cord Input Voltage : AC 100-240V; Input Frequency : 50-60Hz; 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 CT-638 Keyboard