Compatiblity: 9V AC Adapter Charger Replacement for CTK-330 CTK-401 CTK-411 Keyboard Power Supply PwrON is specializing in the production of high quality and economical replacement power supply for laptop tablet phones and other electrical appliances. Products manufactured with the highest quality materials and include multiple smart features safeguarding against IV - incorrect voltage SC - short circuit IO - internal overheating . Chargers are certificated with CE FCC etc. Please contact us with any questions or concerns - we are here to help!