AC / DC power adapter for Casio CT-636 CT636 Keyboard Power Supply...Specialty,Service,Satisfaction! All products are fully-tested OEM equivalent replacement parts , In Great Working Condition. World Wide Input Voltage 100-240VAC 50/60Hz 30 days money back guarantee. We also ship your order the same or next day (Amazon order processing time varies)! Please contact us with any questions or concerns - we are here to help! (Phone service is available).