Amazon.com: AC/DC Power Adapter Works with Power Compatible with CASIO CTK-240 CTK240 Keyboard : Musical Instruments
Casio CTK-4400 61-Key Portable Keyboard | Reverb
Amazon.com: MyVolts 9V Power Supply Adaptor Compatible with/Replacement for Casio CTK-240 Keyboard - US Plug : Musical Instruments
Amazon.com: 9.5V AC/DC Adapter for Casio Keyboard AD-E95100LU Power Supply Charger SA-46 SA-47 LK-125 LK-127 CTK-240 CTK-245 CTK-1100 for Casio ADE95100LU, 100-240V AC to 9.5V DC Converter : Musical Instruments