Antoble 9V AC DC Adapter Charger for Casio CT-607 CT-370 CTK-558 CTK-515 Keyboard replacement power supply adaptor Antoble products are made with the highest quality materials tested by manufacturer to match and/or exceed specifications of OEM products. Industry Quality : Over voltage protection, Over heat protection, CE. Build in Dynamic IC, Charger IC & Power fuse for rapid charging and over charge protection. Total cord length is extended to 6.5ft / 2M. Antoble product has a 30 day Money-Back Guarantee and a 1-year limited warranty.